Andre wants to be sure that when he gets a new computer, he can get all his music on it via iTunes. First, he should make sure he puts all the music into one main folder and then moves that folder onto a USB Key. Then put that into the new computer and use the "Add to Library" feature to import from that folder to the new iTunes library.
Can he do it from the iPod? Sure. It's a bit harder, but Leo recommends Senuti to do that.