Using Time Capsule for Backing Up a RAID Array

I am setting up an 8TB RAID 0 array at home. I am going to use 4 - 2TB FW drives. I already have an SSD in my 3.4 Ghz i7 iMac but am speed hungry and since I have the drives, I figure I would play a bit. I know it is vital to have solid back-up for this, but I am unsure of the best back-up solution. I am wondering if I can attach 3 - 3TB drives to my 1TB Time Capsule and use the combined 10TB in Time Machine to back it up? To date I have backed up each drive separately, but am realizing the folly of that and want to explore RAID 0 at the same time as explore a new back-up solution. Everything I read tells me I need a drive for backing up the RAID array that is at least as large as the combined total of the array. That doesn't make sense if the array is so large... I can't find anywhere if Time Machine supports spanning mulitple back-up drives.