If Windows Backup hung, then certainly that's a problem, but it does not necessarily indicate the problem was caused by the backup program - especially if it only failed once after a significant history of working fine. A single file could have been stuck open, or a driver hiccuped, or something else.
If I had a history of backups normally taking 30 minutes, I would not abandon my backup program for one isolated failure. I would have run out of backup and imaging programs years ago. None have a perfect record.
In looking back through my installed updates, I don't see any recent changes to Windows Backup, but I did not dig too deeply as there have been quite a few in the last 2 months.
That said, win7few22, I applaud you for backing up your systems. Sadly, you are a rare breed!