Back up my data
This setting controls whether the backup service should run on this device. The service ensures that certain operating system settings and application data is regularly backed up.
Google's backup and restore functionality should be considered an convenience only. You should not use it as your sole backup, and you will always need to back up videos and photos you have taken.
Note: Some devices may offer backup services by other companies in addition to Google, such as a Samsung backup service offered on some Samsung devices, in which case similar settings will appear for the other services. The exact details of what is backed up and how it can be restored may differ between such services.
This allows certain settings such as Wi-Fi passwords, and certain application data to be restored after resetting the device.