Hi Before i did this i thought it best to ask the question here. Basically i have two huge iTunes libraries. One for official music, the other for unofficial stuff. Both of these libraries have their own separate external hard drives. For one of the libraries i have Time machine backing it up using a 3rd external hard drive. What i need to do is add a 4th external hard drive to back up the other library using the same Mac and same Time Machine. Can this be done does anybody know? Im on 10.6.8 so quite old but its fine for what i need. Many thanks.