5. You could stop there. You have a complete backup of your music, and a way of tracking new music added. But if you were to have a meltdown, and lost your library on your computer, you would want to be able to restore it to the exact condition it was in at the time of loss, including all of your playlists. In order to do that you would want to backup 2 additional filesÂ? Â?iTunes LibraryÂ? and Â?iTunes Music Library.xmlÂ?. They are located in ~/Music/iTunes/. These small data files contain all the info about your library and playlists. In case of loss, you would reinstall iTunes, drag all the files from your backup discs back onto iTunes to import them, and then replace the new versions of these 2 files with your archived copies. You only need to do this step to recover your playlists. You donÂ?t need them to simply recover your music.