SSD as boot drive in MacPro

[bazookaman]

hal wrote:
An alternative you might consider: 2 x 2TB 7200RPM striped raid as a boot drive. That's what I'm using and it's pretty damned fast - and it's 4TB

I actually have 2 tb 7200 drives now. One boot and one clone. I could RAID them together. But then I'd need a backup. So how does one go about doing that in a MacPro? Is that a RAID set up in Disk Utility?