Here's how to ensure your Gmail, contacts, apps, etc. are backed up on your Galaxy J3 V / Galaxy J3.
- Backups can't be restored from a higher Android™ version onto a phone with a lower Android version.
- When a Google account is added to your phone, previous backups are restored. This can be done by adding an existing Google account to your already active phone or by signing in to the same Google account while setting up your new or reset phone.