I have an iMac and a 2011 13" MBP, both running Lion 10.7.2 with iTunes 10.5.3. The iMac is the main system, and I do all the iTunes purchases there for an iPhone 4S, an iPod Touch 4G, and an iPod Touch 3G. What I wanted to do was to have a full copy of iTunes stuff on the MBP, including the device backups. After searching threads and banging my head against the wall a bit, I've come up with what I needed to move: Copy as below: in HD/Music/iTunes Copy the iTunes folder. (The main iTunes lib) In HD/Library/Application Support/MobileSync (device backups) Copy the Backup folder. in HD/Library/iTunes Copy everything under it: (3 directories) iPod Software Updates iTunes Plug-ins Mobile Backups ------------ This seems to be working, and I was hoping anyone who's done this in the past would review this and see if I have missed anything.