I just moved my library, about 11,000 photos total with some RAW but mostly jpgs, over from iPhoto to Aperture. What I'd like to know from some of you is what is the best way for backing up my photos? Should I just use Time Machine, or back up through Aperture? I'm looking at getting a 2TB external to do the backing up, or should I just back them up to DVD? I'd appreciate any help/input. Thanks! 