My iMac is running out of room on the internal drive. I want to move my movies and pictures off to an external device. I am currently backing everything up using Time Machine (and Super Duper). What I would like to do is move them off but maintain redundancy in case of a drive failure (in other words mirror the external drives). I was at the Apple store today and the rep there suggested a Drobo device. It looks really cool. But, the problem is I saw a lot of negative feedback on it, including data loss which totally defeats the purpose of paying so much money for it. I'm looking for a way to basically have two 1 TB drives mirrored off of my iMac that I can put my iPhoto, iTunes and Movies onto. Any advice would be greatly appreciated.