Can’t login to Google drive for backup.

if you keep failing to loging in,

1. Try using same google account as you are loging into Google play store.
2. Make sure your phone/device is currently logging into Google account. Then use same account.
3. Press “Sign out from google” and try again.
4. Once close the app from multi task, then restart.
5. It would be problem is occuring in Google side, so try again later.

Usually, it will be like this video.