In attempting to install bootcamp on my MBP which was recent;y upgraded to leord, I was told that boot camp assistant could not partition my HD because of unmoveable files. It reccommended that I back up my files, that I format my internal HD and that I then copy everything back. However, being a n00b, I am not sure where to begin and don't wanna mess up. Should I back everythng up with time machine? Will my computer really stary while attached to merely a portable hard drive with nothing on my internal drive? I have a custom built external storage with 2 320 gig hard drives and I have a maxxtor 1 touch with 180 gb. Both use USB. Will time machine create a bootable backup on my external and is there anything I should be careful NOT to do?