I just recently got an iMac, and have a few external drives in rotation now. I used to keep my itunes library on one drive for use with my macbook, but i put the music portion on the iMac's internal drive this time. I have a 250GB drive just about filled with movies, a 250 GB NAS drive filled, and i just recently bought a 320GB MyBook drive that I was using to boot an iBook with a dead drive. I am planning on leaving my tv shows and movies on the external drives, but i have two back up questions. First is should i just use the MyBook as my Time Machine Drive now? And how should I back up my Tv Shows, and Movies from the other externals. Any tips is greatly appreciated.