I'm getting lost trying to think about the 3-2-1 backup strategy I have: - Windows PC with 1 SSD. - Unraid server with 4 HDD's where 1 is a parity drive.

I want to backup files I have on Windows and Unraid. Those file itself are 1 copy. I can also store a copy on Backblaze B2. For my last copy, would it be fine to have it on my Unraid drive since it has parity? Or would it make more sense to use an external HDD?