Forgive me if this is answered elsewhere. I did search for a while but did not fine this answered. How large a drive should I get for so that I can use Time Machine for my Macs? I have an iMac with a 250GB Drive (75GB Used and don't expect to go over 150GB for quite a while). I also have a MacBook with and 80GB drive (20GB user and don't expect to go over 60GB for quite a while). I'd like to go with the 500GB Time Capsule. Will that be enough or do I need 1TB?