I'm about to switch from syncing my 4g 60GB iPod with my old PC desktop to my new 20" iMac. Before I do, I'd like to back it up, "just in case." Is there a free Mac app that will do this? Without making me stand on one foot while facing a particular compass direction at midnight in Wellington (I'm in San Antonio) and with my tongue held a certain way?

Really, simple would be greatly more helpful than "this will do it, but only after..." sorts of apps.