Hey! I've decided to reset my mac from OS X to OS X, again. Well, I know that iPod Touch's only work at one iTunes a time, so what am I going to do when I reset my mac? Because if you plug-in your iPod to another pc/mac, then the only way to get songs, videos and whatever, on the iPod from the other pc/mac, is to delete the songs on your iPod? Wtf do I do ? Of course I want to keep all my app's, songs and videos etc. I've heard about something about doing a backup to an external hard drive? But how can I do that? Thanks!