Thanks for your replies. Just to give you a bit of background. I have two backup drives and two portable drives. I create disk image backup of my main external drive on one external 120 and the other on a 160gb hard disk drive, (I only have 23,000 songs, and haven't cleaned out the dupes) and a complete image of one of my laptops on a 60GB drive.
I am planning on purchasing an External portable drive like one of the WD Passport drives or one of the Seagate FreeAgent portables, since they will run off two USB ports, and they are getting less expensive to purchase. I want to cut down what I have to carry to the very basic.