diff --git a/www/manager6/window/Backup.js b/www/manager6/window/Backup.js
index 7c1c54d..648bf7a 100644
--- a/www/manager6/window/Backup.js
+++ b/www/manager6/window/Backup.js
@@ -189,6 +189,14 @@ Ext.define('PVE.window.Backup', {
                             if (!initialDefaults && data.mode !== undefined) {
                                 modeSelector.setValue(data.mode);
                             }
+                            if (!initialDefaults && me.vmtype === 'qemu' && data.fleecing) {
+                                fleecingStorageSelector.setValue(data.fleecing.storage);
+                                fleecingCheckbox.setValue(data.fleecing.enabled);
+                                // only changed fleecing settings are sent, so that the node's
+                                // defaults keep working without permissions on their storage
+                                fleecingStorageSelector.resetOriginalValue();
+                                fleecingCheckbox.resetOriginalValue();
+                            }
                             if (!initialDefaults && (data['notes-template'] ?? false)) {
                                 me.down('field[name=notes-template]').setValue(
                                     PVE.Utils.unEscapeNotesTemplate(data['notes-template']),
@@ -245,10 +253,45 @@ Ext.define('PVE.window.Backup', {
             padding: '0 0 1 0',
         });
 
+        let fleecingStorageSelector = Ext.create('PVE.form.StorageSelector', {
+            nodename: me.nodename,
+            name: 'fleecing-storage',
+            fieldLabel: gettext('Fleecing Storage'),
+            storageContent: 'images',
+            allowBlank: false,
+            disabled: true,
+            hidden: me.vmtype !== 'qemu',
+        });
+
+        let fleecingCheckbox = Ext.create('Proxmox.form.Checkbox', {
+            name: 'fleecing-enabled',
+            checked: false,
+            hidden: me.vmtype !== 'qemu',
+            uncheckedValue: 0,
+            fieldLabel: gettext('Fleecing'),
+            autoEl: {
+                tag: 'div',
+                'data-qtip': gettext(
+                    'Backup write cache that can reduce IO pressure inside guests (VMs only).',
+                ),
+            },
+            handler: function (checkbox, value) {
+                fleecingStorageSelector.setDisabled(!value);
+                fleecingStorageSelector.validate();
+            },
+        });
+
         me.formPanel = Ext.create('Proxmox.panel.InputPanel', {
             bodyPadding: 10,
             border: false,
-            column1: [storagesel, modeSelector, protectedCheckbox, pbsChangeDetection],
+            column1: [
+                storagesel,
+                modeSelector,
+                protectedCheckbox,
+                fleecingCheckbox,
+                fleecingStorageSelector,
+                pbsChangeDetection,
+            ],
             column2: [compressionSelector, notificationModeSelector, mailtoField, removeCheckbox],
             columnB: [
                 {
@@ -331,6 +374,14 @@ Ext.define('PVE.window.Backup', {
                     params.protected = values.protected;
                 }
 
+                if (fleecingCheckbox.isDirty() || fleecingStorageSelector.isDirty()) {
+                    let fleecing = { enabled: values['fleecing-enabled'] };
+                    if (values['fleecing-enabled']) {
+                        fleecing.storage = values['fleecing-storage'];
+                    }
+                    params.fleecing = PVE.Parser.printPropertyString(fleecing);
+                }
+
                 if (values['pbs-change-detection-mode']) {
                     params['pbs-change-detection-mode'] = values['pbs-change-detection-mode'];
                 }
@@ -369,6 +420,10 @@ Ext.define('PVE.window.Backup', {
             },
         });
 
+        fleecingStorageSelector.on('validitychange', (field, valid) =>
+            submitBtn.setDisabled(!valid),
+        );
+
         var helpBtn = Ext.create('Proxmox.button.Help', {
             onlineHelp: 'chapter_vzdump',
             listenToGlobalEvent: false,