Yes, it can. To activate this option, please:

  1. Open G Cloud App.
  2. Go to the menu in the upper left corner.
  3. Tap on Settings.
  4. Tap on Auto-Upload.
  5. Change the Connection Type to Any connection (3G/WiFi…).
  1. Open G Cloud App.
  2. Tap the Settings icon Settings.
  3. Uncheck the Backup only on WiFi option.
  1. Open G Cloud App.
  2. Go to the menu in the upper left corner.
  3. Tap on Settings.
  4. Tap on Use Cellular Data.

 If at anytime you run the backup manually, G Cloud will use any available connection.