Queso's the expert here. And I'm going to agree with his "Yes".
My gut feeling is that you're not changing enough data to fill 8 drives anything like regularly, and that this is almost entirely something like FS scenery (or pr0n
) that is write-once read-only.
If so, I'd be inclined to consolidate into a NAS with at least the same capacity (using fewer, bigger, faster drives), and keep the old box powered off in a cupboard (possibly even off-site) as a cold back-up - leaving you with only the new stuff to back up.
But it depends how hard it is to recover all that stuff, and how important.
Let him that hath understanding count the number of the beast:
For it is the number of a man; and its number is One hundred threescore and twelve.