Time Machine was saying there was no room on the external drive, though there was plenty of room (1.21 gigs available on 2 gig drive). I had had this same problem a while ago and Apple Help told me a way to reset time machine, but I couldn't remember how to do it. I thought it involved turning Time Machine off and trashing the plist (prefs) file for time machine and restarting. I did that, and it fixed the problem. It ran for a few minutes and completed the backup as awlays. But now the backup only goes to yesterday, when the problem arose with TIme Machine. Anybody know if those older backups still exist, and if there's a way to have Time Machine see that? thanks.