operaguy: I went for a Raid1 array [mirrored] on my new set up for one reason and one reason only.
I regularly back up to XHD and DVD and last year I had 2 internal HD's fry on me, the second time, when using the back ups from the XHD it became corrupted and so I had to back up from the DVD's which took a lot longer.
With the Raid1 array I have now, I see it as additional back up and if one fails, it's straight down to the shop for a new drive, hopefully this covers me for most events!  [LOL].
And yes I'm still backing up to XHD and DVD [just in case, LOL].

Injustice will be avenged.
Cofiwch Dryweryn.