Where on OneDrive does the backup files show? I have never have seen a backup file on OneDrive. Though it shows in manage backups that a backup exists.!Login to OneDrive and delete the existing backup file(s), re-try from phone.
Well I did try deleting the old backup and now the backup is done.It's been a long day at the end of a long week. I was confused. You're correct - it's in the Manage Backups option on the phone. Just delete the old one and re-try.