@Bas: robocopy rules
Basically a number of scripts that robocopy a set of folders to the external drives (to one on monday night, to the other on thursday night) and a full one to the 3TB (yet to decide when).
My source code is on a local Perforce server (backed up as well) and i have an additional couple of 2.5" portable drives for yet another copy of photos and documents.
The power consumption was another factor in my decision, alongside with noise and heat in the room. I looked at external housing for the drives, but in the end they fit in my Sonata II just fine.