I have 2 Macs in the house, with a 3rd coming soon. I backup mine to an external hard drive using Time Machine, but neither of the others have a backup plan in place. One user doesn't really need a robust backup solution, but the person getting a mac soon does. I was thinking I could kill two birds with one stone if I got a Time Capsule. Now I've read all about how you can partition Time Capsule and stuff like that (and I'm technical enough that I could probably pull that off if I wanted to, but I don't think I do). What I haven't found out is what the Time Capsule does if two users have been syncing to it, and on the next backup it runs out of space. Does it just delete the oldest backup? Or the oldest backup by that user? Is it possible for one user to backup so frequently they get rid of all the other users' backups? Basically, what's the process (algorithm) that Time Capsule uses to allocate space and delete backups when multiple users are involved?