Anyone using an Ipod (or other MP3 hard drive, for that matter) as a mobile hard drive backup? I'm thinking I can kill two birds with one stone, so to speak, if I get a hard drive MP3 with max. capacity, and use roughly half for music, half for file backup. (I'm assuming it's possible to use MP3 jukebox software for transferring music, and have the MP3 hard drive "show up" as an extra drive to drag and drop files I need backed up without too much formatting difficulty.) Any comments out there from the experts?