diff --git a/@xen-orchestra/proxy/app/mixins/remotes.mjs b/@xen-orchestra/proxy/app/mixins/remotes.mjs
index f806008fa77..816ae36c48b 100644
--- a/@xen-orchestra/proxy/app/mixins/remotes.mjs
+++ b/@xen-orchestra/proxy/app/mixins/remotes.mjs
@@ -3,6 +3,7 @@ import { compose } from '@vates/compose'
 import { decorateMethodsWith } from '@vates/decorate-with'
 import { deduped } from '@vates/disposable/deduped.js'
 import { getHandler } from '@xen-orchestra/fs'
+import { RemoteAdapter } from '@xen-orchestra/backups/RemoteAdapter.mjs'
 
 export default class Remotes {
   constructor(app) {
@@ -31,6 +32,21 @@ export default class Remotes {
             },
           },
         ],
+
+        getTotalBackupSize: [
+          ({ remote }) =>
+            Disposable.use(this.getHandler(remote), handler => {
+              const remoteAdapter = new RemoteAdapter(handler, {
+                debounceResource: app.debounceResource.bind(app),
+              })
+              return remoteAdapter.getTotalBackupSize()
+            }),
+          {
+            params: {
+              remote: { type: 'object' },
+            },
+          },
+        ],
       },
     })
   }
diff --git a/CHANGELOG.unreleased.md b/CHANGELOG.unreleased.md
index c08bd94d95f..c5f7c96f89b 100644
--- a/CHANGELOG.unreleased.md
+++ b/CHANGELOG.unreleased.md
@@ -33,7 +33,9 @@
 
 <!--packages-start-->
 
+- @xen-orchestra/proxy minor
 - @xen-orchestra/xapi patch
 - xen-api patch
+- xo-server minor
 
 <!--packages-end-->
diff --git a/packages/xo-server/src/xo-mixins/remotes.mjs b/packages/xo-server/src/xo-mixins/remotes.mjs
index 02988e53fa8..e2f08a75019 100644
--- a/packages/xo-server/src/xo-mixins/remotes.mjs
+++ b/packages/xo-server/src/xo-mixins/remotes.mjs
@@ -10,6 +10,7 @@ import { synchronized } from 'decorator-synchronized'
 
 import patch from '../patch.mjs'
 import { Remotes } from '../models/remote.mjs'
+import Disposable from 'promise-toolbox/Disposable'
 
 // ===================================================================
 
@@ -297,4 +298,16 @@ export default class {
 
     await this._remotes.remove(id)
   }
+
+  async getTotalBackupSizeOnRemote(id) {
+    const remote = await this._getRemote(id)
+
+    if (remote.proxy !== undefined) {
+      return this._app.callProxyMethod(remote.proxy, 'remote.getTotalBackupSize', {
+        remote,
+      })
+    }
+
+    return Disposable.use(this._app.getBackupsRemoteAdapter(remote), adapter => adapter.getTotalBackupSize())
+  }
 }
diff --git a/packages/xo-server/src/xo-mixins/rest-api.mjs b/packages/xo-server/src/xo-mixins/rest-api.mjs
index 6e43f569378..589d21545b0 100644
--- a/packages/xo-server/src/xo-mixins/rest-api.mjs
+++ b/packages/xo-server/src/xo-mixins/rest-api.mjs
@@ -9,7 +9,6 @@ import { pipeline } from 'node:stream/promises'
 import { json, Router } from 'express'
 import { Readable } from 'node:stream'
 import cloneDeep from 'lodash/cloneDeep.js'
-import Disposable from 'promise-toolbox/Disposable'
 import groupBy from 'lodash/groupBy.js'
 import path from 'node:path'
 import pDefer from 'promise-toolbox/defer'
@@ -251,9 +250,8 @@ async function _getDashboardStats(app) {
         continue
       }
 
-      const totalBackupSize = await Disposable.use(app.getBackupsRemoteAdapter(backupRepository), adapter =>
-        adapter.getTotalBackupSize()
-      )
+      const totalBackupSize = await app.getTotalBackupSizeOnRemote(backupRepository.id)
+
       const { available, size, used } = backupRepositoryInfo
 
       const isS3 = type === 's3'