Solution Steps

1. Google backup: Settings → System → Backup → Toggle on "Back up to Google Drive".
2. Manual backup: Settings → System → Backup → Back up now.
3. Backup photos: Google Photos app → Enable auto backup.
4. Computer backup: Connect via USB → Enable file transfer → Copy files to computer.
5. Use manufacturer backup (Samsung Cloud, etc.) if available.
6. Third-party apps: Use Titanium Backup or similar for advanced backups.