After you log in to your Amber, toggle the switch next to Enable Auto Backup
Once the switch is toggled, select the Amber you would like to backup to and tap Confirm.
To enable background backup:
Go to Settings > Backup & Upload > Background Service.
Run in the Background: Indefinite with enough power
Camera Roll Backup: Enable
Download & Upload: Enable
Note: Please be aware that there is a limit to how long an app can run in the background, whether iOS or Android. There is a strict limit by iOS to limit background activity by Apple with the exception of its Camera Roll/Photos app. iOS will kill the app even if we enable it to run indefinitely and/or will be killed due to a large battery drain from excessive background activity.