I have a Mac Pro with three disks. I have been backing up for ages with Time Machine to one of the extra disks without issue. For some reason TM now wants to hang. It starts, enumerates all the files and starts the backup. But it will almost immediately get to some real small number like 50 K of 50 MB and just get stuck there. Yesterday, I rebooted the Mac and manually kicked one off and it ran just fine. But again today, it's doing the same thing.