1. If you didn't select to back up your files when setting up the tablet, drag down the notification panel from the top of the screen and touch the Settings icon.
2. Touch Users & accounts.
3. If Automatically sync data toggle is OFF, touch it to activate syncing.
4. Touch OK.
5. Touch your Google account.
6. Touch Account sync.
7. Touch all the toggle switches for the items you wish regularly backed up. After you have finished touch the Back icon.
8. Touch the Back icon.
9. Touch the Back icon.
10. Touch Google.
11. Touch Backup.
12. Ensure the Back up to Google Drive is selected.
13. Touch Google Photos if it's set to OFF.
14. Touch the Back up & sync toggle to activate it.
15. Touch the Back icon.
16. Touch Back up now to begin the back up process.