Back up all ya'll MP3z on an external hardrive... then get one more that is only for your house and backup again... Take the first hardrive and take it to as many of your folks' house as you can and hook 'em up while y'all blow trees... it's fool proof... You'll end up with your MP3 collection backed up on 2 hardrives and a gang of others at various locations... With my method, you'll never lose a MP3 again!
I got over 11,000 in my collection and it takes up less than 60 GB... These days you can get 500 G hard drives for less than 2 bills... $89.00 can get you 160 Gigs... My boy just got a 500 gig and is about to slide thru and dump off 40 gigs... OH boy!