I just bought a wd 500gb external drive for back-up and it includes what seems to be a very easy to use back-up program. I have never used a backup for anything before so this is new to me. What I intend on doing is backing everything onto the drive so I can delete files off the macbook, for example my itunes library which takes up most of my measly 79 gb hard drive. so what I want to do is be able to put the music back on the mac whenever i need to access it in itunes, or do i even need to do that? Can I simply get to my music from the external without putting it back on the mac? So if anyone has used WD passport b.u. software, and the time machine, what is better? The other question is if the hard drive crashes will I be able to re-install everything from the backup that was done using either the time machine or the WD software?