This question makes me reconsider Drobo, but I have a concern about data transfer rates. Wouldn't the USB (or LAN) connection be a significant bottleneck to my system?
My home media center PC has a system disk and 2 x 1TB data disks for video and audio = 3 SATA drives on the motherboard controller. It's a hassle to expand this storage, but perhaps a NAS could help.
If this were on a Drobo, and I use USB to connect it, wouldn't I have much slower data rates? Or if I had a Drobo with LAN, then my LAN would be the bottleneck, right?
I realize a Drobo or any other NAS solution just covers storage, not backup, so ideally one would have another NAS (if I win the lottery) at a friend's place and mirror the two.