"Never been backed up" but no error
I have an iPad Pro 12.9". I have the latest version of iOS on it and the latest version of iTunes on my Windows 10 PC. Ever since I did a restore to factory settings a few weeks ago, iTunes insists that my "iPad has never been backed up to this computer," This despite the fact that I set it to back up to the computer. It syncs fine and the backup steep takes a while and then it moves on. No error messages. When I manually click "Back Up Now" the backup runs for a while and seems to complete. No error message, but iTunes still says never backed uo and there are no stored backups to restore. Any ideas? Thanks!
Home Built, Windows 7