I was told today by an Apple retail employee that Time Machine will not back up from anything other than an internal drive and I wanted to confirm whether this was the case. For example I have an iMac with a 750GB internal and I also have a 750GB external drive. I want to keep my iTunes Music and iPhoto libraries on the internal but keep all my movies on the external drive for space reasons. I want to then use a 2TB external drive to work with Time Machine. I was told that if I want to back up the 750 "Movies" drive that I will need to manually copy it because Time Machine will only back up the path of those files and that drive can't be included in the backup. To me this seems to go against what TM is about, since I then have to manually manage that part of the backup, adding new items, rather than getting the benefits of TM's incremental backup. Can anyone confirm or deny this. Second question is regarding TM for multiple machines. Can a 2TB drive be used as the TM drive for both an iMac and a MacBook or will the drive need to be partitioned?