Google Drive Backup Errors

I have started to get regular (daily) error notifications about my Google Drive Backup. As it hasn't been fixed quickly or notified by anyone else, I wonder if it has anything to do with just upgrading to Android 13 Beta 2.

I get a notification showing the backup progress bar and it is at 0%. And it stays like that until it is dismissed. I can go into the app and manually "Send to Google Drive" and that works fine.

I am also getting a different notification saying that the format of my Google backup is wrong (or something like that - I haven't got it at the moment) and I should log out and log back in again. I do this but it makes no difference.

Has anyone else had this error?