I was recently trying to configure automatic backups for a friend’s computer, the idea being that once a week his important files would be backed up to his .Mac account. Having remote backup is one of the reasons he is paying for a .Mac membership. It’s not an ideal or comprehensive backup solution, but definitely a good thing.
But, the whole point is it’s supposed to be automatic, transparent, set and forget, don’t think about it until the time comes when you have to restore. The problem is, the backups just keep taking up more and more space on his .Mac account. Eventually it fills up. And Backup stops working.