Very interesting. I know that some companies are promoting that their NAS solution can do this. One that comes to mind is the N2100P by Thecus.
http://www.thecus.com/products_over....e32b2cf4e032f3
Although I don't know very much about this product it seems to be getting fairly good reviews on newegg.com. What Snap Server are you using? Are you using it with a Mac?