Comment Drobo (Score 1) 611
Now first of all, I think it is perfectly fine to use RAID as a backup as long as it is *not the primary storage* of the machine you are backing up.
I have been considering Drobo as a backup device but the high price keeps putting me off. However, unlike standard RAID implementations, Drobo's is unique where it is expandable. Just pop out the smallest disk and pop in a larger one. I think for people as myself that have growing libraries and growing home directories, maintainence of a backup device that easy should be appealing, since it gives us more time to think about how to migrate data off primary storage to a larger disk, or how to add an extra disk to the LVM, etc.