diff --git a/client/src/api/datasets.ts b/client/src/api/datasets.ts
index 63b8b5714d9c..a82b2022a63e 100644
--- a/client/src/api/datasets.ts
+++ b/client/src/api/datasets.ts
@@ -47,11 +47,10 @@ export async function fetchDatasetDetails(params: { id: string }): Promise<Datas
     return data as unknown as DatasetDetails;
 }
 
-const updateHistoryDataset = fetcher.path("/api/histories/{history_id}/contents/{type}s/{id}").method("put").create();
+const updateDataset = fetcher.path("/api/datasets/{dataset_id}").method("put").create();
 
-export async function undeleteHistoryDataset(historyId: string, datasetId: string) {
-    const { data } = await updateHistoryDataset({
-        history_id: historyId,
+export async function undeleteHistoryDataset(datasetId: string) {
+    const { data } = await updateDataset({
         id: datasetId,
         type: "dataset",
         deleted: false,
@@ -59,13 +58,10 @@ export async function undeleteHistoryDataset(historyId: string, datasetId: strin
     return data;
 }
 
-const deleteHistoryDataset = fetcher
-    .path("/api/histories/{history_id}/contents/{type}s/{id}")
-    .method("delete")
-    .create();
+const deleteDataset = fetcher.path("/api/datasets/{dataset_id}").method("delete").create();
 
-export async function purgeHistoryDataset(historyId: string, datasetId: string) {
-    const { data } = await deleteHistoryDataset({ history_id: historyId, id: datasetId, type: "dataset", purge: true });
+export async function purgeHistoryDataset(datasetId: string) {
+    const { data } = await deleteDataset({ id: datasetId, purge: true });
     return data;
 }
 
diff --git a/client/src/api/users.ts b/client/src/api/users.ts
index 7a59d96ea839..2b3fca5b279d 100644
--- a/client/src/api/users.ts
+++ b/client/src/api/users.ts
@@ -3,6 +3,7 @@ import { fetcher } from "@/api/schema";
 export const createApiKey = fetcher.path("/api/users/{user_id}/api_key").method("post").create();
 export const deleteUser = fetcher.path("/api/users/{user_id}").method("delete").create();
 export const fetchQuotaUsages = fetcher.path("/api/users/{user_id}/usage").method("get").create();
+export const fetchObjectStoreUsages = fetcher.path("/api/users/{user_id}/objectstore_usage").method("get").create();
 export const recalculateDiskUsage = fetcher.path("/api/users/current/recalculate_disk_usage").method("put").create();
 export const recalculateDiskUsageByUserId = fetcher
     .path("/api/users/{user_id}/recalculate_disk_usage")
diff --git a/client/src/components/User/DiskUsage/StorageDashboard.vue b/client/src/components/User/DiskUsage/StorageDashboard.vue
index 0f141bdc0a34..70628d155ab7 100644
--- a/client/src/components/User/DiskUsage/StorageDashboard.vue
+++ b/client/src/components/User/DiskUsage/StorageDashboard.vue
@@ -20,14 +20,22 @@ const texts = reactive({
         icon: "fas fa-broom fa-6x",
         buttonText: localize("Free up disk usage"),
     },
-    explore: {
-        title: localize("Visually explore your disk usage"),
+    explore_by_history: {
+        title: localize("Visually explore your disk usage by history"),
         description: localize(
-            "Want to know what histories or datasets take up the most space in your account? Here you can explore your disk usage in a visual way."
+            "Want to know what histories or datasets take up the most space in your account? Here you can explore your disk usage in a visual way by history."
         ),
         icon: "fas fa-chart-pie fa-6x",
         buttonText: localize("Explore now"),
     },
+    explore_by_objectstore: {
+        title: localize("Visually explore your disk usage by object store"),
+        description: localize(
+            "Want to know how the space in your account is being distributed by object store? Here you can explore your disk usage in a visual way by object store."
+        ),
+        icon: "fas fa-hdd fa-6x",
+        buttonText: localize("Explore now"),
+    },
 });
 
 function goToStorageManager() {
@@ -37,6 +45,10 @@ function goToStorageManager() {
 function goToHistoriesOverview() {
     router.push({ name: "HistoriesOverview" });
 }
+
+function goToObjectStoresOverview() {
+    router.push({ name: "ObjectStoresOverview" });
+}
 </script>
 
 <template>
@@ -60,10 +72,19 @@ function goToHistoriesOverview() {
         <IconCard
             class="mx-auto mb-3"
             data-description="explore usage card"
-            :title="texts.explore.title"
-            :description="texts.explore.description"
-            :icon="texts.explore.icon"
-            :button-text="texts.explore.buttonText"
+            :title="texts.explore_by_history.title"
+            :description="texts.explore_by_history.description"
+            :icon="texts.explore_by_history.icon"
+            :button-text="texts.explore_by_history.buttonText"
             @onButtonClick="goToHistoriesOverview" />
+
+        <IconCard
+            class="mx-auto mb-3"
+            data-description="explore object store usage card"
+            :title="texts.explore_by_objectstore.title"
+            :description="texts.explore_by_objectstore.description"
+            :icon="texts.explore_by_objectstore.icon"
+            :button-text="texts.explore_by_objectstore.buttonText"
+            @onButtonClick="goToObjectStoresOverview" />
     </div>
 </template>
diff --git a/client/src/components/User/DiskUsage/Visualizations/HistoriesStorageOverview.vue b/client/src/components/User/DiskUsage/Visualizations/HistoriesStorageOverview.vue
index 9d63b587c5e0..770c274e4740 100644
--- a/client/src/components/User/DiskUsage/Visualizations/HistoriesStorageOverview.vue
+++ b/client/src/components/User/DiskUsage/Visualizations/HistoriesStorageOverview.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { onMounted, ref } from "vue";
+import { ref } from "vue";
 import { useRouter } from "vue-router/composables";
 
 import { useConfirmDialog } from "@/composables/confirmDialog";
@@ -8,13 +8,14 @@ import { useHistoryStore } from "@/stores/historyStore";
 import localize from "@/utils/localization";
 
 import type { DataValuePoint } from "./Charts";
-import { bytesLabelFormatter, bytesValueFormatter } from "./Charts/formatters";
 import { fetchAllHistoriesSizeSummary, type ItemSizeSummary, purgeHistoryById, undeleteHistoryById } from "./service";
+import { byteFormattingForChart, useDataLoading } from "./util";
 
 import BarChart from "./Charts/BarChart.vue";
 import OverviewPage from "./OverviewPage.vue";
 import RecoverableItemSizeTooltip from "./RecoverableItemSizeTooltip.vue";
 import SelectedItemActions from "./SelectedItemActions.vue";
+import WarnDeletedHistories from "./WarnDeletedHistories.vue";
 import LoadingSpan from "@/components/LoadingSpan.vue";
 
 const historyStore = useHistoryStore();
@@ -25,17 +26,16 @@ const { confirm } = useConfirmDialog();
 const historiesSizeSummaryMap = new Map<string, ItemSizeSummary>();
 const topTenHistoriesBySizeData = ref<DataValuePoint[] | null>(null);
 const activeVsArchivedVsDeletedTotalSizeData = ref<DataValuePoint[] | null>(null);
-const isLoading = ref(true);
 const numberOfHistoriesToDisplayOptions = [10, 20, 50];
 const numberOfHistoriesToDisplay = ref(numberOfHistoriesToDisplayOptions[0]);
 
-onMounted(async () => {
-    isLoading.value = true;
+const { isLoading, loadDataOnMount } = useDataLoading();
+
+loadDataOnMount(async () => {
     const allHistoriesSizeSummary = await fetchAllHistoriesSizeSummary();
     allHistoriesSizeSummary.forEach((history) => historiesSizeSummaryMap.set(history.id, history));
 
     buildGraphsData();
-    isLoading.value = false;
 });
 
 function buildGraphsData() {
@@ -155,13 +155,7 @@ async function onPermanentlyDeleteHistory(historyId: string) {
         <p class="text-justify">
             Here you can find various graphs displaying the storage size taken by <b>all your histories</b>.
         </p>
-        <p class="text-justify">
-            Note: these graphs include <b>deleted histories</b>. Remember that, even if you delete histories, they still
-            take up storage space. However, you can free up the storage space by permanently deleting them from the
-            <i>Discarded Items</i> section of the
-            <router-link :to="{ name: 'StorageManager' }"><b>Storage Manager</b></router-link> page or by selecting them
-            individually in the graph and clicking the <b>Permanently Delete</b> button.
-        </p>
+        <WarnDeletedHistories />
 
         <div v-if="isLoading" class="text-center">
             <LoadingSpan class="mt-5" :message="localize('Loading your storage data. This may take a while...')" />
@@ -176,8 +170,7 @@ async function onPermanentlyDeleteHistory(historyId: string) {
                 "
                 :data="topTenHistoriesBySizeData"
                 :enable-selection="true"
-                :label-formatter="bytesLabelFormatter"
-                :value-formatter="bytesValueFormatter">
+                v-bind="byteFormattingForChart">
                 <template v-slot:title>
                     <b>{{ localize(`Top ${numberOfHistoriesToDisplay} Histories by Size`) }}</b>
                     <b-form-select
@@ -218,8 +211,7 @@ async function onPermanentlyDeleteHistory(historyId: string) {
                     )
                 "
                 :data="activeVsArchivedVsDeletedTotalSizeData"
-                :label-formatter="bytesLabelFormatter"
-                :value-formatter="bytesValueFormatter">
+                v-bind="byteFormattingForChart">
                 <template v-slot:tooltip="{ data }">
                     <RecoverableItemSizeTooltip
                         v-if="data"
diff --git a/client/src/components/User/DiskUsage/Visualizations/HistoryStorageOverview.vue b/client/src/components/User/DiskUsage/Visualizations/HistoryStorageOverview.vue
index f6bf8c8434db..fa6c69c17b24 100644
--- a/client/src/components/User/DiskUsage/Visualizations/HistoryStorageOverview.vue
+++ b/client/src/components/User/DiskUsage/Visualizations/HistoryStorageOverview.vue
@@ -1,30 +1,22 @@
 <script setup lang="ts">
-import { onMounted, ref } from "vue";
+import { ref } from "vue";
 import { useRouter } from "vue-router/composables";
 
-import { useConfirmDialog } from "@/composables/confirmDialog";
-import { useToast } from "@/composables/toast";
 import { useHistoryStore } from "@/stores/historyStore";
 import localize from "@/utils/localization";
 
 import type { DataValuePoint } from "./Charts";
-import { bytesLabelFormatter, bytesValueFormatter } from "./Charts/formatters";
-import {
-    fetchHistoryContentsSizeSummary,
-    type ItemSizeSummary,
-    purgeDatasetById,
-    undeleteDatasetById,
-} from "./service";
+import { fetchHistoryContentsSizeSummary, type ItemSizeSummary } from "./service";
+import { buildTopNDatasetsBySizeData, byteFormattingForChart, useDataLoading, useDatasetsToDisplay } from "./util";
 
 import BarChart from "./Charts/BarChart.vue";
 import OverviewPage from "./OverviewPage.vue";
 import RecoverableItemSizeTooltip from "./RecoverableItemSizeTooltip.vue";
 import SelectedItemActions from "./SelectedItemActions.vue";
+import WarnDeletedDatasets from "./WarnDeletedDatasets.vue";
 import LoadingSpan from "@/components/LoadingSpan.vue";
 
 const router = useRouter();
-const { success: successToast, error: errorToast } = useToast();
-const { confirm } = useConfirmDialog();
 const { getHistoryNameById } = useHistoryStore();
 
 interface Props {
@@ -33,40 +25,39 @@ interface Props {
 
 const props = defineProps<Props>();
 
-const datasetsSizeSummaryMap = new Map<string, ItemSizeSummary>();
-const topTenDatasetsBySizeData = ref<DataValuePoint[] | null>(null);
 const activeVsDeletedTotalSizeData = ref<DataValuePoint[] | null>(null);
-const isLoading = ref(true);
-const numberOfDatasetsToDisplayOptions = [10, 20, 50];
-const numberOfDatasetsToDisplay = ref(numberOfDatasetsToDisplayOptions[0]);
-
-onMounted(async () => {
-    isLoading.value = true;
-    const limit = Math.max(...numberOfDatasetsToDisplayOptions);
-    const allDatasetsInHistorySizeSummary = await fetchHistoryContentsSizeSummary(props.historyId, limit);
+const {
+    numberOfDatasetsToDisplayOptions,
+    numberOfDatasetsToDisplay,
+    numberOfDatasetsLimit,
+    datasetsSizeSummaryMap,
+    topNDatasetsBySizeData,
+    isRecoverableDataPoint,
+    onUndeleteDataset,
+    onPermanentlyDeleteDataset,
+} = useDatasetsToDisplay();
+
+const { isLoading, loadDataOnMount } = useDataLoading();
+
+loadDataOnMount(async () => {
+    const allDatasetsInHistorySizeSummary = await fetchHistoryContentsSizeSummary(
+        props.historyId,
+        numberOfDatasetsLimit
+    );
     allDatasetsInHistorySizeSummary.forEach((dataset) => datasetsSizeSummaryMap.set(dataset.id, dataset));
 
     buildGraphsData();
-    isLoading.value = false;
 });
 
 function buildGraphsData() {
     const allDatasetsInHistorySizeSummary = Array.from(datasetsSizeSummaryMap.values());
-    topTenDatasetsBySizeData.value = buildTopTenDatasetsBySizeData(allDatasetsInHistorySizeSummary);
+    topNDatasetsBySizeData.value = buildTopNDatasetsBySizeData(
+        allDatasetsInHistorySizeSummary,
+        numberOfDatasetsToDisplay.value
+    );
     activeVsDeletedTotalSizeData.value = buildActiveVsDeletedTotalSizeData(allDatasetsInHistorySizeSummary);
 }
 
-function buildTopTenDatasetsBySizeData(datasetsSizeSummary: ItemSizeSummary[]): DataValuePoint[] {
-    const topTenDatasetsBySize = datasetsSizeSummary
-        .sort((a, b) => b.size - a.size)
-        .slice(0, numberOfDatasetsToDisplay.value);
-    return topTenDatasetsBySize.map((dataset) => ({
-        id: dataset.id,
-        label: dataset.name,
-        value: dataset.size,
-    }));
-}
-
 function buildActiveVsDeletedTotalSizeData(datasetsSizeSummary: ItemSizeSummary[]): DataValuePoint[] {
     const activeDatasetsSize = datasetsSizeSummary
         .filter((dataset) => !dataset.deleted)
@@ -88,14 +79,6 @@ function buildActiveVsDeletedTotalSizeData(datasetsSizeSummary: ItemSizeSummary[
     ];
 }
 
-function isRecoverableDataPoint(dataPoint?: DataValuePoint): boolean {
-    if (dataPoint) {
-        const historiesSizeSummary = datasetsSizeSummaryMap.get(dataPoint.id || "");
-        return historiesSizeSummary?.deleted || dataPoint.id === "deleted";
-    }
-    return false;
-}
-
 async function onViewDataset(datasetId: string) {
     router.push({
         name: "DatasetDetails",
@@ -106,45 +89,12 @@ async function onViewDataset(datasetId: string) {
     });
 }
 
-async function onUndeleteDataset(datasetId: string) {
-    try {
-        const result = await undeleteDatasetById(props.historyId, datasetId);
-        const dataset = datasetsSizeSummaryMap.get(datasetId);
-        if (dataset && !result.deleted) {
-            dataset.deleted = result.deleted;
-            datasetsSizeSummaryMap.set(datasetId, dataset);
-            successToast(localize("Dataset undeleted successfully."));
-            buildGraphsData();
-        }
-    } catch (error) {
-        errorToast(`${error}`, localize("An error occurred while undeleting the dataset."));
-    }
+function onPermDelete(datasetId: string) {
+    onPermanentlyDeleteDataset(buildGraphsData, datasetId);
 }
 
-async function onPermanentlyDeleteDataset(datasetId: string) {
-    const confirmed = await confirm(
-        localize("Are you sure you want to permanently delete this dataset? This action cannot be undone."),
-        {
-            title: localize("Permanently delete dataset?"),
-            okVariant: "danger",
-            okTitle: localize("Permanently delete"),
-            cancelTitle: localize("Cancel"),
-        }
-    );
-    if (!confirmed) {
-        return;
-    }
-    try {
-        const result = await purgeDatasetById(props.historyId, datasetId);
-        const dataset = datasetsSizeSummaryMap.get(datasetId);
-        if (dataset && result) {
-            datasetsSizeSummaryMap.delete(datasetId);
-            successToast(localize("Dataset permanently deleted successfully."));
-            buildGraphsData();
-        }
-    } catch (error) {
-        errorToast(`${error}`, localize("An error occurred while permanently deleting the dataset."));
-    }
+function onUndelete(datasetId: string) {
+    onUndeleteDataset(buildGraphsData, datasetId);
 }
 </script>
 <template>
@@ -157,36 +107,28 @@ async function onPermanentlyDeleteDataset(datasetId: string) {
             <router-link :to="{ name: 'HistoriesOverview' }"><b>Histories Storage Overview</b></router-link> page to see
             the storage taken by <b>all your histories</b>.
         </p>
-        <p class="text-justify">
-            Note: these graphs include <b>deleted datasets</b>. Remember that, even if you delete datasets, they still
-            take up storage space. However, you can free up the storage space by permanently deleting them from the
-            <i>Discarded Items</i> section of the
-            <router-link :to="{ name: 'StorageManager' }"><b>Storage Manager</b></router-link> page or by selecting them
-            individually in the graph and clicking the <b>Permanently Delete</b> button.
-        </p>
-
+        <WarnDeletedDatasets />
         <div v-if="isLoading" class="text-center">
             <LoadingSpan class="mt-5" :message="localize('Loading your storage data. This may take a while...')" />
         </div>
         <div v-else>
             <BarChart
-                v-if="topTenDatasetsBySizeData"
+                v-if="topNDatasetsBySizeData"
                 :description="
                     localize(
                         `These are the ${numberOfDatasetsToDisplay} datasets that take the most space in this history. Click on a bar to see more information about the dataset.`
                     )
                 "
+                :data="topNDatasetsBySizeData"
                 :enable-selection="true"
-                :data="topTenDatasetsBySizeData"
-                :label-formatter="bytesLabelFormatter"
-                :value-formatter="bytesValueFormatter">
+                v-bind="byteFormattingForChart">
                 <template v-slot:title>
                     <b>{{ localize(`Top ${numberOfDatasetsToDisplay} Datasets by Size`) }}</b>
                     <b-form-select
                         v-model="numberOfDatasetsToDisplay"
                         :options="numberOfDatasetsToDisplayOptions"
                         :disabled="isLoading"
-                        title="Number of histories to show"
+                        title="Number of datasets to show"
                         class="float-right w-auto"
                         size="sm"
                         @change="buildGraphsData()">
@@ -204,8 +146,8 @@ async function onPermanentlyDeleteDataset(datasetId: string) {
                         item-type="dataset"
                         :is-recoverable="isRecoverableDataPoint(data)"
                         @view-item="onViewDataset"
-                        @undelete-item="onUndeleteDataset"
-                        @permanently-delete-item="onPermanentlyDeleteDataset" />
+                        @undelete-item="onUndelete"
+                        @permanently-delete-item="onPermDelete" />
                 </template>
             </BarChart>
 
@@ -218,8 +160,7 @@ async function onPermanentlyDeleteDataset(datasetId: string) {
                     )
                 "
                 :data="activeVsDeletedTotalSizeData"
-                :label-formatter="bytesLabelFormatter"
-                :value-formatter="bytesValueFormatter">
+                v-bind="byteFormattingForChart">
                 <template v-slot:tooltip="{ data }">
                     <RecoverableItemSizeTooltip
                         v-if="data"
diff --git a/client/src/components/User/DiskUsage/Visualizations/ObjectStoreActions.vue b/client/src/components/User/DiskUsage/Visualizations/ObjectStoreActions.vue
new file mode 100644
index 000000000000..e8753eb2c197
--- /dev/null
+++ b/client/src/components/User/DiskUsage/Visualizations/ObjectStoreActions.vue
@@ -0,0 +1,48 @@
+<script setup lang="ts">
+import { library } from "@fortawesome/fontawesome-svg-core";
+import { faChartBar } from "@fortawesome/free-solid-svg-icons";
+import { FontAwesomeIcon } from "@fortawesome/vue-fontawesome";
+import { BButton } from "bootstrap-vue";
+import { computed } from "vue";
+
+import localize from "@/utils/localization";
+
+import type { DataValuePoint } from "./Charts";
+
+interface Props {
+    data: DataValuePoint;
+}
+
+const props = defineProps<Props>();
+
+library.add(faChartBar);
+
+const label = computed(() => props.data.id);
+const viewDetailsIcon = computed(() => "chart-bar");
+
+const emit = defineEmits<{
+    (e: "view-item", itemId: string): void;
+}>();
+
+function onViewItem() {
+    emit("view-item", props.data.id);
+}
+</script>
+<template>
+    <div class="selected-item-info">
+        <div class="h-md mx-2">
+            <b>{{ label }}</b>
+        </div>
+
+        <div class="my-2">
+            <BButton
+                variant="outline-primary"
+                size="sm"
+                class="mx-2"
+                :title="localize(`Go to the details of this object store`)"
+                @click="onViewItem">
+                <FontAwesomeIcon :icon="viewDetailsIcon" />
+            </BButton>
+        </div>
+    </div>
+</template>
diff --git a/client/src/components/User/DiskUsage/Visualizations/ObjectStoreStorageOverview.vue b/client/src/components/User/DiskUsage/Visualizations/ObjectStoreStorageOverview.vue
new file mode 100644
index 000000000000..06237e694f62
--- /dev/null
+++ b/client/src/components/User/DiskUsage/Visualizations/ObjectStoreStorageOverview.vue
@@ -0,0 +1,123 @@
+<script setup lang="ts">
+import { useRouter } from "vue-router/composables";
+
+import { fetchObjectStoreContentsSizeSummary } from "./service";
+import { buildTopNDatasetsBySizeData, byteFormattingForChart, useDataLoading, useDatasetsToDisplay } from "./util";
+
+import BarChart from "./Charts/BarChart.vue";
+import OverviewPage from "./OverviewPage.vue";
+import RecoverableItemSizeTooltip from "./RecoverableItemSizeTooltip.vue";
+import SelectedItemActions from "./SelectedItemActions.vue";
+import WarnDeletedDatasets from "./WarnDeletedDatasets.vue";
+import LoadingSpan from "@/components/LoadingSpan.vue";
+
+interface Props {
+    objectStoreId: string;
+}
+
+const props = defineProps<Props>();
+
+const router = useRouter();
+
+const {
+    numberOfDatasetsToDisplayOptions,
+    numberOfDatasetsToDisplay,
+    numberOfDatasetsLimit,
+    datasetsSizeSummaryMap,
+    topNDatasetsBySizeData,
+    isRecoverableDataPoint,
+    onUndeleteDataset,
+    onPermanentlyDeleteDataset,
+} = useDatasetsToDisplay();
+
+const { isLoading, loadDataOnMount } = useDataLoading();
+
+loadDataOnMount(async () => {
+    const allDatasetsInObjectStoreSizeSummary = await fetchObjectStoreContentsSizeSummary(
+        props.objectStoreId,
+        numberOfDatasetsLimit
+    );
+    allDatasetsInObjectStoreSizeSummary.forEach((dataset) => datasetsSizeSummaryMap.set(dataset.id, dataset));
+
+    buildGraphsData();
+});
+
+function buildGraphsData() {
+    const allDatasetsInObjectStoreSizeSummary = Array.from(datasetsSizeSummaryMap.values());
+    topNDatasetsBySizeData.value = buildTopNDatasetsBySizeData(
+        allDatasetsInObjectStoreSizeSummary,
+        numberOfDatasetsToDisplay.value
+    );
+}
+
+async function onViewDataset(datasetId: string) {
+    router.push({
+        name: "DatasetDetails",
+        params: {
+            datasetId: datasetId,
+        },
+    });
+}
+
+function onPermDelete(datasetId: string) {
+    onPermanentlyDeleteDataset(buildGraphsData, datasetId);
+}
+
+function onUndelete(datasetId: string) {
+    onUndeleteDataset(buildGraphsData, datasetId);
+}
+</script>
+
+<template>
+    <OverviewPage title="Object Store Storage Overview">
+        <p class="text-justify">
+            Here you will find some Graphs displaying the storage taken by datasets in the object store:
+            <b>{{ objectStoreId }}</b
+            >. You can use these graphs to identify the datasets that take the most space in this object store.
+        </p>
+        <WarnDeletedDatasets />
+        <div v-if="isLoading" class="text-center">
+            <LoadingSpan class="mt-5" :message="localize('Loading your storage data. This may take a while...')" />
+        </div>
+        <div v-else>
+            <BarChart
+                v-if="topNDatasetsBySizeData"
+                :description="
+                    localize(
+                        `These are the ${numberOfDatasetsToDisplay} datasets that take the most space in this history. Click on a bar to see more information about the dataset.`
+                    )
+                "
+                v-bind="byteFormattingForChart"
+                :enable-selection="true"
+                :data="topNDatasetsBySizeData">
+                <template v-slot:title>
+                    <b>{{ localize(`Top ${numberOfDatasetsToDisplay} Datasets by Size`) }}</b>
+                    <b-form-select
+                        v-model="numberOfDatasetsToDisplay"
+                        :options="numberOfDatasetsToDisplayOptions"
+                        :disabled="isLoading"
+                        title="Number of datasets to show"
+                        class="float-right w-auto"
+                        size="sm"
+                        @change="buildGraphsData()">
+                    </b-form-select>
+                </template>
+                <template v-slot:tooltip="{ data }">
+                    <RecoverableItemSizeTooltip
+                        v-if="data"
+                        :data="data"
+                        :is-recoverable="isRecoverableDataPoint(data)" />
+                </template>
+                <template v-slot:selection="{ data }">
+                    <SelectedItemActions
+                        :data="data"
+                        item-type="dataset"
+                        :is-recoverable="isRecoverableDataPoint(data)"
+                        @view-item="onViewDataset"
+                        @permanently-delete-item="onPermDelete"
+                        @undelete-item="onUndelete" />
+                </template>
+            </BarChart>
+        </div>
+    </OverviewPage>
+</template>
diff --git a/client/src/components/User/DiskUsage/Visualizations/ObjectStoresStorageOverview.vue b/client/src/components/User/DiskUsage/Visualizations/ObjectStoresStorageOverview.vue
new file mode 100644
index 000000000000..79af90cf7bb3
--- /dev/null
+++ b/client/src/components/User/DiskUsage/Visualizations/ObjectStoresStorageOverview.vue
@@ -0,0 +1,71 @@
+<script setup lang="ts">
+import { ref } from "vue";
+import { useRouter } from "vue-router/composables";
+
+import { fetchObjectStoreUsages } from "@/api/users";
+import localize from "@/utils/localization";
+
+import type { DataValuePoint } from "./Charts";
+import { byteFormattingForChart, useDataLoading } from "./util";
+
+import BarChart from "./Charts/BarChart.vue";
+import ObjectStoreActions from "./ObjectStoreActions.vue";
+import OverviewPage from "./OverviewPage.vue";
+import ShowObjectStore from "./ShowObjectStore.vue";
+import WarnDeletedHistories from "./WarnDeletedHistories.vue";
+import LoadingSpan from "@/components/LoadingSpan.vue";
+
+const router = useRouter();
+
+const objectStoresBySizeData = ref<DataValuePoint[] | null>(null);
+
+const { isLoading, loadDataOnMount } = useDataLoading();
+
+loadDataOnMount(async () => {
+    const { data } = await fetchObjectStoreUsages({ user_id: "current" });
+    const objectStoresBySize = data.sort((a, b) => b.total_disk_usage - a.total_disk_usage);
+    objectStoresBySizeData.value = objectStoresBySize.map((objectStore) => ({
+        id: objectStore.object_store_id,
+        label: objectStore.object_store_id,
+        value: objectStore.total_disk_usage,
+    }));
+});
+
+function onViewObjectStore(objectStoreId: string) {
+    router.push({ name: "ObjectStoreOverview", params: { objectStoreId } });
+}
+</script>
+<template>
+    <OverviewPage title="Object Stores Storage Overview">
+        <p class="text-justify">
+            Here you can find various graphs displaying the storage size taken by all your histories grouped by object
+            store.
+        </p>
+        <WarnDeletedHistories />
+        <div v-if="isLoading" class="text-center">
+            <LoadingSpan class="mt-5" :message="localize('Loading your storage data. This may take a while...')" />
+        </div>
+        <div v-else>
+            <BarChart
+                v-if="objectStoresBySizeData"
+                :description="
+                    localize(
+                        `This graph displays how your Galaxy data is stored sorted into the the object store is stored in. Click on a bar to see more information about the object store.`
+                    )
+                "
+                :data="objectStoresBySizeData"
+                :enable-selection="true"
+                v-bind="byteFormattingForChart">
+                <template v-slot:title>
+                    <b>{{ localize(`Object Stores by Usage`) }}</b>
+                </template>
+                <template v-slot:tooltip="{ data }">
+                    <ShowObjectStore v-if="data" :object-store-id="data.id" />
+                </template>
+                <template v-slot:selection="{ data }">
+                    <ObjectStoreActions :data="data" @view-item="onViewObjectStore" />
+                </template>
+            </BarChart>
+        </div>
+    </OverviewPage>
+</template>
diff --git a/client/src/components/User/DiskUsage/Visualizations/ShowObjectStore.vue b/client/src/components/User/DiskUsage/Visualizations/ShowObjectStore.vue
new file mode 100644
index 000000000000..313f2f6c0142
--- /dev/null
+++ b/client/src/components/User/DiskUsage/Visualizations/ShowObjectStore.vue
@@ -0,0 +1,50 @@
+<script setup lang="ts">
+import { ref, watch } from "vue";
+
+import { getObjectStoreDetails } from "@/api/objectStores";
+import type { ConcreteObjectStoreModel } from "@/components/ObjectStore/types";
+import { errorMessageAsString } from "@/utils/simple-error";
+
+import LoadingSpan from "@/components/LoadingSpan.vue";
+import DescribeObjectStore from "@/components/ObjectStore/DescribeObjectStore.vue";
+
+interface Props {
+    objectStoreId: string;
+}
+
+const props = defineProps<Props>();
+
+const objectStore = ref<ConcreteObjectStoreModel | null>(null);
+const loading = ref(true);
+const error = ref<string | null>(null);
+
+async function fetch() {
+    loading.value = true;
+    try {
+        objectStore.value = await getObjectStoreDetails(props.objectStoreId);
+    } catch (e) {
+        error.value = errorMessageAsString(e);
+    } finally {
+        loading.value = false;
+    }
+}
+
+watch(
+    () => props.objectStoreId,
+    async () => {
+        fetch();
+    }
+);
+fetch();
+const loadingMessage = "Loading object store details";
+const forWhat = "This object store is";
+</script>
+
+<template>
+    <div style="width: 300px">
+        <LoadingSpan v-if="loading" :message="loadingMessage | localize" />
+        <DescribeObjectStore v-else-if="objectStore != null" :what="forWhat" :storage-info="objectStore">
+        </DescribeObjectStore>
+        <b-alert v-else-if="error" show variant="danger">{{ error }}</b-alert>
+    </div>
+</template>
diff --git a/client/src/components/User/DiskUsage/Visualizations/WarnDeletedDatasets.vue b/client/src/components/User/DiskUsage/Visualizations/WarnDeletedDatasets.vue
new file mode 100644
index 000000000000..65ac06f9a170
--- /dev/null
+++ b/client/src/components/User/DiskUsage/Visualizations/WarnDeletedDatasets.vue
@@ -0,0 +1,9 @@
+<template>
+    <p class="text-justify">
+        Note: these graphs include <b>deleted datasets</b>. Remember that, even if you delete datasets, they still take
+        up storage space. However, you can free up the storage space by permanently deleting them from the
+        <i>Discarded Items</i> section of the
+        <router-link :to="{ name: 'StorageManager' }"><b>Storage Manager</b></router-link> page or by selecting them
+        individually in the graph and clicking the <b>Permanently Delete</b> button.
+    </p>
+</template>
diff --git a/client/src/components/User/DiskUsage/Visualizations/WarnDeletedHistories.vue b/client/src/components/User/DiskUsage/Visualizations/WarnDeletedHistories.vue
new file mode 100644
index 000000000000..aa11326c2e07
--- /dev/null
+++ b/client/src/components/User/DiskUsage/Visualizations/WarnDeletedHistories.vue
@@ -0,0 +1,9 @@
+<template>
+    <p class="text-justify">
+        Note: these graphs include <b>deleted histories</b>. Remember that, even if you delete histories, they still
+        take up storage space. However, you can free up the storage space by permanently deleting them from the
+        <i>Discarded Items</i> section of the
+        <router-link :to="{ name: 'StorageManager' }"><b>Storage Manager</b></router-link> page or by selecting them
+        individually in the graph and clicking the <b>Permanently Delete</b> button.
+    </p>
+</template>
diff --git a/client/src/components/User/DiskUsage/Visualizations/service.ts b/client/src/components/User/DiskUsage/Visualizations/service.ts
index 2a83827c8cd8..e88481eca64f 100644
--- a/client/src/components/User/DiskUsage/Visualizations/service.ts
+++ b/client/src/components/User/DiskUsage/Visualizations/service.ts
@@ -45,6 +45,17 @@ export async function fetchHistoryContentsSizeSummary(historyId: string, limit =
     return response.data as unknown as ItemSizeSummary[];
 }
 
+export async function fetchObjectStoreContentsSizeSummary(objectStoreId: string, limit = 5000) {
+    const response = await datasetsFetcher({
+        keys: itemSizeSummaryFields,
+        limit,
+        order: "size-dsc",
+        q: ["purged", "history_content_type", "object_store_id"],
+        qv: ["false", "dataset", objectStoreId],
+    });
+    return response.data as unknown as ItemSizeSummary[];
+}
+
 export async function undeleteHistoryById(historyId: string): Promise<ItemSizeSummary> {
     const response = await undeleteHistory({ history_id: historyId });
     return response.data as unknown as ItemSizeSummary;
@@ -55,12 +66,12 @@ export async function purgeHistoryById(historyId: string): Promise<PurgeableItem
     return response.data as unknown as PurgeableItemSizeSummary;
 }
 
-export async function undeleteDatasetById(historyId: string, datasetId: string): Promise<ItemSizeSummary> {
-    const data = await undeleteHistoryDataset(historyId, datasetId);
+export async function undeleteDatasetById(datasetId: string): Promise<ItemSizeSummary> {
+    const data = await undeleteHistoryDataset(datasetId);
     return data as unknown as ItemSizeSummary;
 }
 
-export async function purgeDatasetById(historyId: string, datasetId: string): Promise<PurgeableItemSizeSummary> {
-    const data = await purgeHistoryDataset(historyId, datasetId);
+export async function purgeDatasetById(datasetId: string): Promise<PurgeableItemSizeSummary> {
+    const data = await purgeHistoryDataset(datasetId);
     return data as unknown as PurgeableItemSizeSummary;
 }
diff --git a/client/src/components/User/DiskUsage/Visualizations/util.ts b/client/src/components/User/DiskUsage/Visualizations/util.ts
new file mode 100644
index 000000000000..40fd0629a102
--- /dev/null
+++ b/client/src/components/User/DiskUsage/Visualizations/util.ts
@@ -0,0 +1,119 @@
+import { onMounted, ref } from "vue";
+
+import { useConfirmDialog } from "@/composables/confirmDialog";
+import { useToast } from "@/composables/toast";
+import localize from "@/utils/localization";
+
+import type { DataValuePoint } from "./Charts";
+import { bytesLabelFormatter, bytesValueFormatter } from "./Charts/formatters";
+import { type ItemSizeSummary, purgeDatasetById, undeleteDatasetById } from "./service";
+
+interface DataLoader {
+    (): Promise<undefined>;
+}
+
+interface DataReload {
+    (): void;
+}
+
+export function useDatasetsToDisplay() {
+    const numberOfDatasetsToDisplayOptions = [10, 20, 50];
+    const numberOfDatasetsToDisplay = ref<number>(numberOfDatasetsToDisplayOptions[0] || 10);
+    const numberOfDatasetsLimit = Math.max(...numberOfDatasetsToDisplayOptions);
+    const datasetsSizeSummaryMap = new Map<string, ItemSizeSummary>();
+    const topNDatasetsBySizeData = ref<DataValuePoint[] | null>(null);
+
+    function isRecoverableDataPoint(dataPoint?: DataValuePoint): boolean {
+        if (dataPoint) {
+            const datasetSizeSummary = datasetsSizeSummaryMap.get(dataPoint.id || "");
+            return datasetSizeSummary?.deleted || dataPoint.id === "deleted";
+        }
+        return false;
+    }
+
+    const { success: successToast, error: errorToast } = useToast();
+    const { confirm } = useConfirmDialog();
+
+    async function onUndeleteDataset(reloadData: DataReload, datasetId: string) {
+        try {
+            const result = await undeleteDatasetById(datasetId);
+            const dataset = datasetsSizeSummaryMap.get(datasetId);
+            if (dataset && !result.deleted) {
+                dataset.deleted = result.deleted;
+                datasetsSizeSummaryMap.set(datasetId, dataset);
+                successToast(localize("Dataset undeleted successfully."));
+                reloadData();
+            }
+        } catch (error) {
+            errorToast(`${error}`, localize("An error occurred while undeleting the dataset."));
+        }
+    }
+
+    async function onPermanentlyDeleteDataset(reloadData: DataReload, datasetId: string) {
+        const confirmed = await confirm(
+            localize("Are you sure you want to permanently delete this dataset? This action cannot be undone."),
+            {
+                title: localize("Permanently delete dataset?"),
+                okVariant: "danger",
+                okTitle: localize("Permanently delete"),
+                cancelTitle: localize("Cancel"),
+            }
+        );
+        if (!confirmed) {
+            return;
+        }
+        try {
+            const result = await purgeDatasetById(datasetId);
+            const dataset = datasetsSizeSummaryMap.get(datasetId);
+            if (dataset && result) {
+                datasetsSizeSummaryMap.delete(datasetId);
+                successToast(localize("Dataset permanently deleted successfully."));
+                reloadData();
+            }
+        } catch (error) {
+            errorToast(`${error}`, localize("An error occurred while permanently deleting the dataset."));
+        }
+    }
+
+    return {
+        numberOfDatasetsToDisplayOptions,
+        numberOfDatasetsToDisplay,
+        numberOfDatasetsLimit,
+        datasetsSizeSummaryMap,
+        topNDatasetsBySizeData,
+        isRecoverableDataPoint,
+        onUndeleteDataset,
+        onPermanentlyDeleteDataset,
+    };
+}
+
+export function useDataLoading() {
+    const isLoading = ref(true);
+
+    const loadDataOnMount = (dataLoader: DataLoader) => {
+        onMounted(async () => {
+            isLoading.value = true;
+            await dataLoader();
+            isLoading.value = false;
+        });
+    };
+    return {
+        isLoading,
+        loadDataOnMount,
+    };
+}
+
+export function buildTopNDatasetsBySizeData(datasetsSizeSummary: ItemSizeSummary[], n: number): DataValuePoint[] {
+    const topTenDatasetsBySize = datasetsSizeSummary.sort((a, b) => b.size - a.size).slice(0, n);
+    return topTenDatasetsBySize.map((dataset) => ({
+        id: dataset.id,
+        label: dataset.name,
+        value: dataset.size,
+    }));
+}
+
+export const byteFormattingForChart = {
+    "enable-selection": true,
+    labelFormatter: bytesLabelFormatter,
+    valueFormatter: bytesValueFormatter,
+};
diff --git a/client/src/entry/analysis/routes/storageDashboardRoutes.ts b/client/src/entry/analysis/routes/storageDashboardRoutes.ts
index 12abc3fce492..d1b2833512a2 100644
--- a/client/src/entry/analysis/routes/storageDashboardRoutes.ts
+++ b/client/src/entry/analysis/routes/storageDashboardRoutes.ts
@@ -2,6 +2,8 @@ import StorageManager from "@/components/User/DiskUsage/Management/StorageManage
 import StorageDashboard from "@/components/User/DiskUsage/StorageDashboard.vue";
 import HistoriesStorageOverview from "@/components/User/DiskUsage/Visualizations/HistoriesStorageOverview.vue";
 import HistoryStorageOverview from "@/components/User/DiskUsage/Visualizations/HistoryStorageOverview.vue";
+import ObjectStoresStorageOverview from "@/components/User/DiskUsage/Visualizations/ObjectStoresStorageOverview.vue";
+import ObjectStoreStorageOverview from "@/components/User/DiskUsage/Visualizations/ObjectStoreStorageOverview.vue";
 import Base from "@/entry/analysis/modules/Base.vue";
 
 export default [
@@ -32,6 +34,18 @@ export default [
                 component: HistoryStorageOverview,
                 props: true,
             },
+            {
+                path: "objectstores",
+                name: "ObjectStoresOverview",
+                component: ObjectStoresStorageOverview,
+                props: true,
+            },
+            {
+                path: "objectstores/:objectStoreId",
+                name: "ObjectStoreOverview",
+                component: ObjectStoreStorageOverview,
+                props: true,
+            },
             {
                 path: "*",
                 redirect: { name: "StorageDashboard" },
diff --git a/lib/galaxy/model/__init__.py b/lib/galaxy/model/__init__.py
index 77d518b60618..223c8f2e0f20 100644
--- a/lib/galaxy/model/__init__.py
+++ b/lib/galaxy/model/__init__.py
@@ -657,6 +657,35 @@ def calculate_user_disk_usage_statements(user_id, quota_source_map, for_sqlite=F
     return statements
 
 
+UNIQUE_DATASET_USER_USAGE_PER_OBJECTSTORE = """
+WITH per_user_histories AS
+(
+    SELECT id
+    FROM history
+    WHERE user_id = :id
+        AND NOT purged
+),
+per_hist_hdas AS (
+    SELECT DISTINCT dataset_id
+    FROM history_dataset_association
+    WHERE NOT purged
+        AND history_id IN (SELECT id FROM per_user_histories)
+)
+SELECT COALESCE(SUM(COALESCE(dataset.total_size, dataset.file_size, 0)), 0), dataset.object_store_id
+FROM dataset
+LEFT OUTER JOIN library_dataset_dataset_association ON dataset.id = library_dataset_dataset_association.dataset_id
+WHERE dataset.id IN (SELECT dataset_id FROM per_hist_hdas)
+    AND library_dataset_dataset_association.id IS NULL
+GROUP BY dataset.object_store_id
+"""
+
+
+def calculate_disk_usage_per_objectstore(sa_session, user_id: str):
+    statement = UNIQUE_DATASET_USER_USAGE_PER_OBJECTSTORE
+    params = {"id": user_id}
+    return sa_session.execute(statement, params).all()
+
+
 # move these to galaxy.schema.schema once galaxy-data depends on
 # galaxy-schema.
 class UserQuotaBasicUsage(BaseModel):
@@ -670,6 +699,11 @@ class UserQuotaUsage(UserQuotaBasicUsage):
     quota: Optional[str] = None
 
 
+class UserObjectstoreUsage(BaseModel):
+    object_store_id: str
+    total_disk_usage: float
+
+
 class User(Base, Dictifiable, RepresentById):
     """
     Data for a Galaxy user or admin and relations to their
@@ -1141,6 +1175,11 @@ def attempt_create_private_role(self):
         with transaction(session):
             session.commit()
 
+    def dictify_objectstore_usage(self) -> List[UserObjectstoreUsage]:
+        session = object_session(self)
+        rows = calculate_disk_usage_per_objectstore(session, self.id)
+        return [UserObjectstoreUsage(object_store_id=r[1], total_disk_usage=r[0]) for r in rows if r[1]]
+
     def dictify_usage(self, object_store=None) -> List[UserQuotaBasicUsage]:
         """Include object_store to include empty/unused usage info."""
         used_labels: Set[Union[str, None]] = set()
diff --git a/lib/galaxy/webapps/galaxy/api/history_contents.py b/lib/galaxy/webapps/galaxy/api/history_contents.py
index 4f1933514014..611c9888dd85 100644
--- a/lib/galaxy/webapps/galaxy/api/history_contents.py
+++ b/lib/galaxy/webapps/galaxy/api/history_contents.py
@@ -802,6 +802,23 @@ def update_typed(
             trans, history_id, id, payload.model_dump(exclude_unset=True), serialization_params, contents_type=type
         )
 
+    @router.put(
+        "/api/datasets/{dataset_id}",
+        summary="Updates the values for the history dataset (HDA) item with the given ``ID``.",
+        operation_id="datasets__update_dataset",
+    )
+    def update_dataset(
+        self,
+        dataset_id: HistoryItemIDPathParam,
+        trans: ProvidesHistoryContext = DependsOnTrans,
+        serialization_params: SerializationParams = Depends(query_serialization_params),
+        payload: UpdateHistoryContentsPayload = Body(...),
+    ) -> AnyHistoryContentItem:
+        """Updates the values for the history content item with the given ``ID``."""
+        return self.service.update(
+            trans, None, dataset_id, payload.model_dump(exclude_unset=True), serialization_params, contents_type=HistoryContentType.dataset
+        )
+
     @router.put(
         "/api/histories/{history_id}/contents/{id}",
         summary="Updates the values for the history content item with the given ``ID`` and query specified type. ``/api/histories/{history_id}/contents/{type}s/{id}`` should be used instead.",
@@ -894,6 +911,40 @@ def delete_legacy(
             payload,
         )
 
+    @router.delete(
+        "/api/datasets/{dataset_id}",
+        summary="Delete the history dataset content with the given ``ID``.",
+        responses=CONTENT_DELETE_RESPONSES,
+        operation_id="datasets__delete",
+    )
+    def delete_dataset(
+        self,
+        response: Response,
+        dataset_id: HistoryItemIDPathParam,
+        trans: ProvidesHistoryContext = DependsOnTrans,
+        serialization_params: SerializationParams = Depends(query_serialization_params),
+        purge: Optional[bool] = PurgeQueryParam,
+        recursive: Optional[bool] = RecursiveQueryParam,
+        stop_job: Optional[bool] = StopJobQueryParam,
+        payload: DeleteHistoryContentPayload = Body(None),
+    ):
+        """
+        Delete the history content with the given ``ID`` and path specified type.
+
+        **Note**: Currently does not stop any active jobs for which this dataset is an output.
+        """
+        return self._delete(
+            response,
+            trans,
+            dataset_id,
+            HistoryContentType.dataset,
+            serialization_params,
+            purge,
+            recursive,
+            stop_job,
+            payload,
+        )
+
     def _delete(
         self,
         response: Response,
diff --git a/lib/galaxy/webapps/galaxy/api/users.py b/lib/galaxy/webapps/galaxy/api/users.py
index 03e1511c732d..4487dea7668e 100644
--- a/lib/galaxy/webapps/galaxy/api/users.py
+++ b/lib/galaxy/webapps/galaxy/api/users.py
@@ -38,6 +38,7 @@
     HistoryDatasetAssociation,
     Role,
     UserAddress,
+    UserObjectstoreUsage,
     UserQuotaUsage,
 )
 from galaxy.model.base import transaction
@@ -304,6 +305,21 @@ def usage(
         else:
             return []
 
+    @router.get(
+        "/api/users/{user_id}/objectstore_usage",
+        name="get_user_objectstore_usage",
+        summary="Return the user's object store usage summary broken down by object store ID",
+    )
+    def objectstore_usage(
+        self,
+        trans: ProvidesUserContext = DependsOnTrans,
+        user_id: FlexibleUserIdType = FlexibleUserIdPathParam,
+    ) -> List[UserObjectstoreUsage]:
+        if user := self.service.get_user_full(trans, user_id, False):
+            return user.dictify_objectstore_usage()
+        else:
+            return []
+
     @router.get(
         "/api/users/{user_id}/usage/{label}",
         name="get_user_usage_for_label",
diff --git a/lib/galaxy/webapps/galaxy/services/history_contents.py b/lib/galaxy/webapps/galaxy/services/history_contents.py
index 8ce9db729e45..4634b5113e71 100644
--- a/lib/galaxy/webapps/galaxy/services/history_contents.py
+++ b/lib/galaxy/webapps/galaxy/services/history_contents.py
@@ -607,7 +607,7 @@ def update_permissions(
     def update(
         self,
         trans,
-        history_id: DecodedDatabaseIdField,
+        history_id: Optional[DecodedDatabaseIdField],
         id: DecodedDatabaseIdField,
         payload: Dict[str, Any],
         serialization_params: SerializationParams,
@@ -624,6 +624,10 @@ def update(
         :returns:   an error object if an error occurred or a dictionary containing
                     any values that were different from the original and, therefore, updated
         """
+        if history_id is None:
+            hda = self.hda_manager.get_owned(id, trans.user, current_history=trans.history)
+            history_id = hda.history.id
+
         history = self.history_manager.get_mutable(history_id, trans.user, current_history=trans.history)
         if contents_type == HistoryContentType.dataset:
             return self.__update_dataset(trans, history, id, payload, serialization_params)
diff --git a/test/unit/data/test_quota.py b/test/unit/data/test_quota.py
index 5aea03dac771..1582ab9c0f57 100644
--- a/test/unit/data/test_quota.py
+++ b/test/unit/data/test_quota.py
@@ -142,6 +142,20 @@ def test_calculate_usage_readjusts_incorrect_quota(self):
         u.calculate_and_set_disk_usage(object_store)
         self._refresh_user_and_assert_disk_usage_is(10)
 
+    def test_calculate_objectstore_usage(self):
+        # not strictly a quota check but such similar code and ideas...
+        u = self.u
+
+        self._add_dataset(10, "not_tracked")
+        self._add_dataset(15, "tracked")
+
+        usage = u.dictify_objectstore_usage()
+        assert len(usage) == 2
+
+        usage_dict = dict([(u.object_store_id, u.total_disk_usage) for u in usage])
+        assert int(usage_dict["not_tracked"]) == 10
+        assert int(usage_dict["tracked"]) == 15
+
     def test_calculate_usage_disabled_quota(self):
         u = self.u