diff --git a/cellfinder/napari/curation.py b/cellfinder/napari/curation.py
index bf6258d1..34d60380 100644
--- a/cellfinder/napari/curation.py
+++ b/cellfinder/napari/curation.py
@@ -6,7 +6,10 @@
 import tifffile
 from brainglobe_napari_io.cellfinder.utils import convert_layer_to_cells
 from brainglobe_utils.cells.cells import Cell
+from brainglobe_utils.general.system import delete_directory_contents
 from brainglobe_utils.IO.yaml import save_yaml
+from brainglobe_utils.qtpy.dialog import display_warning
+from brainglobe_utils.qtpy.interaction import add_button, add_combobox
 from magicgui.widgets import ProgressBar
 from napari.qt.threading import thread_worker
 from napari.utils.notifications import show_info
@@ -20,8 +23,6 @@
     QWidget,
 )
 
-from .utils import add_button, add_combobox, display_question
-
 # Constants used throughout
 WINDOW_HEIGHT = 750
 WINDOW_WIDTH = 1500
@@ -173,33 +174,33 @@ def add_loading_panel(self, row: int, column: int = 0):
             self.load_data_layout,
             "Training_data (non_cells)",
             self.point_layer_names,
-            4,
+            row=4,
             callback=self.set_training_data_non_cell,
         )
         self.mark_as_cell_button = add_button(
             "Mark as cell(s)",
             self.load_data_layout,
             self.mark_as_cell,
-            5,
+            row=5,
         )
         self.mark_as_non_cell_button = add_button(
             "Mark as non cell(s)",
             self.load_data_layout,
             self.mark_as_non_cell,
-            5,
+            row=5,
             column=1,
         )
         self.add_training_data_button = add_button(
             "Add training data layers",
             self.load_data_layout,
             self.add_training_data,
-            6,
+            row=6,
         )
         self.save_training_data_button = add_button(
             "Save training data",
             self.load_data_layout,
             self.save_training_data,
-            6,
+            row=6,
             column=1,
         )
         self.load_data_layout.setColumnMinimumWidth(0, COLUMN_WIDTH)
@@ -256,7 +257,7 @@ def add_training_data(self):
 
         overwrite = False
         if self.training_data_cell_layer or self.training_data_non_cell_layer:
-            overwrite = display_question(
+            overwrite = display_warning(
                 self,
                 "Training data layers exist",
                 "Training data layers already exist,  "
@@ -363,7 +364,10 @@ def mark_point_as_type(self, point_type: str):
             )
 
     def save_training_data(
-        self, *, block: bool = False, prompt_for_directory: bool = True
+        self,
+        *,
+        block: bool = False,
+        prompt_for_directory: bool = True,
     ) -> None:
         """
         Parameters
@@ -373,16 +377,45 @@ def save_training_data(
         prompt_for_directory :
             If `True` show a file dialog for the user to select a directory.
         """
+
         if self.is_data_extractable():
             if prompt_for_directory:
                 self.get_output_directory()
+                # if the directory is not empty
+                if any(self.output_directory.iterdir()):
+                    choice = display_warning(
+                        self,
+                        "About to save training data",
+                        "Existing files will be will be deleted. Proceed?",
+                    )
+                    if not choice:
+                        return
             if self.output_directory is not None:
+                self.__prep_directories_for_save()
                 self.__extract_cubes(block=block)
                 self.__save_yaml_file()
                 show_info("Done")
 
             self.update_status_label("Ready")
 
+    def __prep_directories_for_save(self):
+        self.yaml_filename = self.output_directory / "training.yml"
+        self.cell_cube_dir = self.output_directory / "cells"
+        self.no_cell_cube_dir = self.output_directory / "non_cells"
+
+        self.__delete_existing_saved_training_data()
+
+    def __delete_existing_saved_training_data(self):
+        self.yaml_filename.unlink(missing_ok=True)
+        for directory in (
+            self.cell_cube_dir,
+            self.no_cell_cube_dir,
+        ):
+            if directory.exists():
+                delete_directory_contents(directory)
+            else:
+                directory.mkdir(exist_ok=True, parents=True)
+
     def __extract_cubes(self, *, block=False):
         """
         Parameters
@@ -489,18 +522,16 @@ def convert_layers_to_cells(self):
         self.non_cells_to_extract = list(set(self.non_cells_to_extract))
 
     def __save_yaml_file(self):
-        # TODO: implement this in a portable way
-        yaml_filename = self.output_directory / "training.yml"
         yaml_section = [
             {
-                "cube_dir": str(self.output_directory / "cells"),
+                "cube_dir": str(self.cell_cube_dir),
                 "cell_def": "",
                 "type": "cell",
                 "signal_channel": 0,
                 "bg_channel": 1,
             },
             {
-                "cube_dir": str(self.output_directory / "non_cells"),
+                "cube_dir": str(self.no_cell_cube_dir),
                 "cell_def": "",
                 "type": "no_cell",
                 "signal_channel": 0,
@@ -509,7 +540,7 @@ def __save_yaml_file(self):
         ]
 
         yaml_contents = {"data": yaml_section}
-        save_yaml(yaml_contents, yaml_filename)
+        save_yaml(yaml_contents, self.yaml_filename)
 
     def update_progress(self, attributes: dict):
         """
@@ -538,9 +569,15 @@ def extract_cubes(self):
             "non_cells": self.non_cells_to_extract,
         }
 
-        for cell_type, cell_list in to_extract.items():
-            cell_type_output_directory = self.output_directory / cell_type
-            cell_type_output_directory.mkdir(exist_ok=True, parents=True)
+        directories = {
+            "cells": self.cell_cube_dir,
+            "non_cells": self.no_cell_cube_dir,
+        }
+
+        for cell_type in ["cells", "non_cells"]:
+            cell_type_output_directory = directories[cell_type]
+            cell_list = to_extract[cell_type]
+
             self.update_status_label(f"Saving {cell_type}...")
 
             cube_generator = CubeGeneratorFromFile(
diff --git a/cellfinder/napari/utils.py b/cellfinder/napari/utils.py
index 05cda23e..689b2842 100644
--- a/cellfinder/napari/utils.py
+++ b/cellfinder/napari/utils.py
@@ -1,18 +1,10 @@
-from typing import Callable, List, Optional, Tuple
+from typing import List, Tuple
 
 import napari
 import numpy as np
 import pandas as pd
 from brainglobe_utils.cells.cells import Cell
 from pkg_resources import resource_filename
-from qtpy.QtWidgets import (
-    QComboBox,
-    QLabel,
-    QLayout,
-    QMessageBox,
-    QPushButton,
-    QWidget,
-)
 
 brainglobe_logo = resource_filename(
     "cellfinder", "napari/images/brainglobe.png"
@@ -98,83 +90,3 @@ def cells_to_array(cells: List[Cell]) -> Tuple[np.ndarray, np.ndarray]:
     points = cells_df_as_np(df[df["type"] == Cell.CELL])
     rejected = cells_df_as_np(df[df["type"] == Cell.UNKNOWN])
     return points, rejected
-
-
-def add_combobox(
-    layout: QLayout,
-    label: str,
-    items: List[str],
-    row: int,
-    column: int = 0,
-    label_stack: bool = False,
-    callback=None,
-    width: int = 150,
-) -> Tuple[QComboBox, Optional[QLabel]]:
-    """
-    Add a selection box to *layout*.
-    """
-    if label_stack:
-        combobox_row = row + 1
-        combobox_column = column
-    else:
-        combobox_row = row
-        combobox_column = column + 1
-    combobox = QComboBox()
-    combobox.addItems(items)
-    if callback:
-        combobox.currentIndexChanged.connect(callback)
-    combobox.setMaximumWidth = width
-
-    if label is not None:
-        combobox_label = QLabel(label)
-        combobox_label.setMaximumWidth = width
-        layout.addWidget(combobox_label, row, column)
-    else:
-        combobox_label = None
-
-    layout.addWidget(combobox, combobox_row, combobox_column)
-    return combobox, combobox_label
-
-
-def add_button(
-    label: str,
-    layout: QLayout,
-    connected_function: Callable,
-    row: int,
-    column: int = 0,
-    visibility: bool = True,
-    minimum_width: int = 0,
-    alignment: str = "center",
-) -> QPushButton:
-    """
-    Add a button to *layout*.
-    """
-    button = QPushButton(label)
-    if alignment == "center":
-        pass
-    elif alignment == "left":
-        button.setStyleSheet("QPushButton { text-align: left; }")
-    elif alignment == "right":
-        button.setStyleSheet("QPushButton { text-align: right; }")
-
-    button.setVisible(visibility)
-    button.setMinimumWidth(minimum_width)
-    layout.addWidget(button, row, column)
-    button.clicked.connect(connected_function)
-    return button
-
-
-def display_question(widget: QWidget, title: str, message: str) -> bool:
-    """
-    Display a warning in a pop up that informs about overwriting files.
-    """
-    message_reply = QMessageBox.question(
-        widget,
-        title,
-        message,
-        QMessageBox.Yes | QMessageBox.Cancel,
-    )
-    if message_reply == QMessageBox.Yes:
-        return True
-    else:
-        return False
diff --git a/tests/napari/test_utils.py b/tests/napari/test_utils.py
index 480b5457..f8eff803 100644
--- a/tests/napari/test_utils.py
+++ b/tests/napari/test_utils.py
@@ -1,10 +1,6 @@
-import pytest
 from brainglobe_utils.cells.cells import Cell
-from qtpy.QtWidgets import QGridLayout
 
 from cellfinder.napari.utils import (
-    add_button,
-    add_combobox,
     add_layers,
     html_label_widget,
 )
@@ -27,38 +23,3 @@ def test_html_label_widget():
     label_widget = html_label_widget("A nice label", tag="h1")
     assert label_widget["widget_type"] == "Label"
     assert label_widget["label"] == "<h1>A nice label</h1>"
-
-
-@pytest.mark.parametrize("label_stack", [True, False])
-@pytest.mark.parametrize("label", ["A label", None])
-def test_add_combobox(label, label_stack):
-    """
-    Smoke test for add_combobox for all conditional branches
-    """
-    layout = QGridLayout()
-    combobox = add_combobox(
-        layout,
-        row=0,
-        label=label,
-        items=["item 1", "item 2"],
-        label_stack=label_stack,
-    )
-    assert combobox is not None
-
-
-@pytest.mark.parametrize(
-    argnames="alignment", argvalues=["center", "left", "right"]
-)
-def test_add_button(alignment):
-    """
-    Smoke tests for add_button for all conditional branches
-    """
-    layout = QGridLayout()
-    button = add_button(
-        layout=layout,
-        connected_function=lambda: None,
-        label="A button",
-        row=0,
-        alignment=alignment,
-    )
-    assert button is not None