Afternoon. I'm utterly, utterly ignorant on this so if the questions are a little basic, sorry. I'm running Leopard, have the latest iTunes and have an 250GB external hard drive and I wanted to back up all of my music. Originally I just dragged and dropped the whole "Music" folder onto the ex. HD. (Finder window>Music>iTunes>iTunes Media>Music). But within the iTunes folder was five other items named as, Album Artwork, iTunes Library (which says it's an iTunes database file), iTunes Library Extras.itdb, iTunes Library Genius.itdb and iTunes Music Library.xml. And I've since put them all onto the ex. HD. My question is are those four files (Album Artwork speaks for itself I suppose) something that should definitely be backed up as a necessity? And just to follow up on that when I add more music in the future should I just drag and drop the specific new album(s) on or do I need to add those four files again? Not put as well as I'd like but hopefully someone understands.