When I put the system shown below together, I did not install the Raid drivers that came with MB, as I had not thoughts of putting in another HD. I ran across a really good deal on another Seagate 160 HD just like the one in system, and am considering installing for backup of my C drive as well as C drive on my son's computer networked to mine. Do I need to install the Raid drivers now, do I need Raid for backup or can I just install and use for backup? In my older systems, I just installed and plugged in and everything worked; not sure about this one. Thanks.