Thanks Joe, I've been reading about Raid for 15 years and still don't get it and that did not change with you post!

I have 1st generation data on one drive called MAIN 5TB. (this is partitioned for the Mac OS 500GB) and 4.5 data.

Clone drive for that, gets cloned 1x day is called: BACKUP DATA (also is 5tb)

TM is on TIME MACHINE 8TB

And I have a 5TB off site.

Why would a Raid be better or beneficial?