RichReed :
I updated earlier above, but no it is not for the O/S drive..both 2 t/b drives are secondary
Well, a true 'mirror' (RAID 1) does exactly that. Mirrors data across 2 or more drives. It also faithfully mirrors corruption, accidental deletions, and other weirdness.
RAID 1 is
not a backup.
Alternatives:
Option 1. A file copy utility. Copies files and folders to a different drive, often can be scheduled to run unattended.
Currently, I use
SyncBack Free. Give it Source and Targt folders, and it copies over anything new or changed, on a schedule you set.
Can go to multiple locations, on different schedules.
I have a couple of different schedules. Every 12 hours, to another internal drive. Every 24 hours (@3am) copy to a whole other PC on the LAN.
Option 2: Drive imaging. I'm also integrating a new )to me) application, that does drive imaging on a schedule.
Casper. Not free, but so far it seems to be pretty good. 3 license purchase for $70.
Can do daily (or weekly) images, and keep multiple days of images. So...if you notice an issue, and don't know exactly when it happened, you can go back a couple of days to an earlier image....before the problem occurred. Restore that good data.
With a mirror, once the damage is done, it is
done. There is no going back.