I carry my older Toshiba 80 gig Satellite as my backup, but I have Mixmeister on my primary laptop which is my CD library search with visitrax and also holds mixmeister as a backup for my HD2500 and CDs which soon will be changing to Ricks program as it doesnt connect with my screen for some reason in the current fix. Rick get the update finished lol. I also have the Denon HD2500 with a 500 gig external HD 4500 MP3 CD players which soon will only carry 30 discs MP3 and also have a mini dsc player I will have as a backup to the backup backing up. I carry an additional Mackie SRM 450 to back up the two I currently use. This gives me security, actually when I brok out this system I was not used to so many options having graduated from the Mix2 to this system. I love it.