I just got a Time Capsule and I want to use it as a file server as well. While it's 3TB and I think that should be fine, my concern is that Time Machine will just keep backing up indefinitely. So over time it would use those 3TB of space. My HD is 250GB and I was thinking of creating a partition of 750GB so there would be plenty of space for TM backups, but it would hit a threshold and not keep eating away at all the space I want to use as a file server. Does all this logic sound right and is this a good idea?