I didn't even know a motherboard could support 11 drives... wtf
I'm guessing a combination of USB adapters, using the SATA ports on the mobo, and PCI SATA cards is how he managed 11 drives.
Freeze, if you had to guess, how much is on those 11 drives? You could probably condense most of it on one or two 1 or 1.5 terabyte drives. You can get a 1 terabyte drive from GearXS for somewhere around $80.