G Cloud will not allow you to delete a device from your account if you’ve previously restored
some files from that device because those restored files will not be uploaded again from your new device since they are already backed up under the previous one.
If you wish to delete the old device and make G Cloud uploads the files again from the new one, you’ll need to delete your G Cloud account and to sign up again for a new one as the following:
1. Uninstall G Cloud from your phone.
3. Install G Cloud app on your phone.