diff --git a/src/backupcleaner.js b/src/backupcleaner.js
index 1abe90cf6..1828ad858 100644
--- a/src/backupcleaner.js
+++ b/src/backupcleaner.js
@@ -242,11 +242,11 @@ async function cleanupSnapshots(backupConfig) {
     const info = safe.JSON.parse(contents);
     if (!info) return;
 
-    delete info.box;
-
     const progressCallback = (progress) => { debug(`cleanupSnapshots: ${progress.message}`); };
 
     for (const appId of Object.keys(info)) {
+        if (appId === 'box' || appId === 'mail') continue;
+
         const app = await apps.get(appId);
         if (app) continue; // app is still installed