I use a Cavalry 1TB external HD ( mirror back-up system). It wasn't cheap, about $450, but all of my iTunes library is backed-up on it and sitting on the shelf. Since the entire library is also in iTunes on the iMac internal HD there is no need to keep the Cavalry hooked-up. Once the library exceeds the iMac internal HD it will be necessary to make choices as to what stays in the iMac and what is listened to only when pulling it from the Cavalry. My library is about 525 CDs strong and growing. Since getting the Cavalry I no longer burn back-up copies of CDs.
I Tunes Backup
After loading about 500 CD'S I started to think about a way to back up My music. I have my music on a external hard drive now, [ a Mac Mini system ] I see most of you have either a second hard drive or a raid system for backup . I also thought about that way to go but went another way and picked up a external DVD burner and make backup DVD duel layer disk's . I think this is a little simpler for me to do than set up a raid system i know it may be a pain to load all the data back on to a new hard disk when it fails but. I want to know if anybody else is doing this or do you just have several hard drives or a raid set up. Any thoughts on backing up your music for now I own all the CD'S I ripped to the hard drive but that may change [ download , library , friends CD'S ] thanks for your thoughts Marc