diff --git a/frontend/module/instance/model.php b/frontend/module/instance/model.php
index 5a5a9e5f..8e8a0290 100644
--- a/frontend/module/instance/model.php
+++ b/frontend/module/instance/model.php
@@ -1171,7 +1171,7 @@ public function getAutoBackupSettings($instanceID)
         $settings = new stdclass;
         $settings->backupTime = "{$hour}:{$minute}";
         $settings->autoBackup = boolval(zget($instance, 'autoBackup', false));
-        $settings->keepDays   = intval(zget($instance, 'backupKeepDays', 10));
+        $settings->keepDays   = intval(zget($instance, 'backupKeepDays', 7));
         $settings->cycleDays  = 1; /* Cycle days is always is 1 at present. */
 
         return $settings;
diff --git a/frontend/module/system/css/editdomain.css b/frontend/module/system/css/editdomain.css
new file mode 100644
index 00000000..1f7c85f6
--- /dev/null
+++ b/frontend/module/system/css/editdomain.css
@@ -0,0 +1 @@
+table tr th.new-domain-label{vertical-align: top; padding-top: 14px;}
diff --git a/frontend/module/system/view/editdomain.html.php b/frontend/module/system/view/editdomain.html.php
index 682a938c..d431cd19 100644
--- a/frontend/module/system/view/editdomain.html.php
+++ b/frontend/module/system/view/editdomain.html.php
@@ -33,12 +33,12 @@
             <td></td>
           </tr>
           <tr>
-            <th><?php echo $lang->system->domain->newDomain;?></th>
+            <th class='new-domain-label'><?php echo $lang->system->domain->newDomain;?></th>
             <td class='required w-400px'>
               <?php echo html::input('customDomain', zget($domainSettings, 'customDomain', ''), "class='form-control' placeholder=''");?>
               <div class='with-padding'>
                 <span><?php echo $lang->system->domain->setDNS;?></span>
-                <?php echo html::a('#', $lang->system->domain->dnsHelperLink, '', "class='text-primary'");?>
+                <?php echo html::a('https://www.qucheng.com/book/Installation-manual/47.html', $lang->system->domain->dnsHelperLink, '_blank', "class='text-primary'");?>
               </div>
             </td>
             <td></td>