I have a little 2.26ghz Mac Mini and my grandpa has an old G5 iMac. We are going to switch. What is the best way to get my stuff on his iMac and to get his stuff on my Mini? I have a spare 320GB external drive so should I time machine my stuff to that, then wipe the mini THEN migration assisstant his stuff over to it. Then restore my stuff to his old iMac? Problem is that the iMac is only running Leopard while the mini is running Snow Leopard so I'm not sure if that will work, going back to an older OS that is. Advice?