Check what an Android backup will restore before a reset

Android can back up device settings, apps and some data to a Google Account, but individual apps may not restore everything. Photos may be handled by Google Photos, while non-Google accounts and some app data follow their own systems. If you can still use the old phone, verify those details before resetting it.

Check the actual backup​

1. Open Settings → Google services → Backup or the equivalent on your model. Check which Google Account receives the backup, the date of the latest completed run and Backup details. A backup can take time to finish.
2. Inspect your most important apps individually: authenticator, messaging, notes, photos and password manager. Find each app's official transfer or export instructions. Do not assume a phone-wide backup includes its secret keys or every chat.
3. Check Google Photos or another photo service separately and open several recent pictures. Make sure the backup account can be accessed without the old phone's only MFA method.
4. If moving to a new device, restore during setup when offered, then verify contacts, messages, pictures and app sign-ins before wiping the old phone. Google says some transfer options may be unavailable after initial setup.

Compatibility matters​

Google warns that a backup from a newer Android version cannot be fully restored to an older version and that some app data will not transfer. Its backup guide lists what is covered and how to inspect details; the new-device guide explains setup timing. If authentication is the blocker, use our authenticator migration checklist. Do not factory-reset the old device merely to test a backup; use the replacement or a spare device if available.