Ah yes, totally overlooked the write speed. Thanks for pointing that out.
Curious on your thinking on this approach as well. Why not back up everything listed above directly to the unassigned drive that serves as your borg backup? Because essentially don't you end up having 4 copies of everything that is backed up to your unRAID "backup" share?
Original copy
unRAID "backup" share
borg funnel backup of "backup" share
remote backup
Having an additional backup definitely doesn't harm anything (other than space I suppose), but again just curious on your approach as I have a similar set-up.
I need to backup an iMac, Macbook, and PC in additional to the various shares on unRAID. I was going to try out Vorta (borg client for macOS). And with that, set up a similar backup schedule that I'll have with your borg container on unRAID. However, rather than back up my mac devices to a backup share on the unRAID array, create multiple borg repos for each "device" (unRAID, Macbook, iMac, etc.) on the unassigned disk. And then of course sync each repo to a remote backup location. Still tying to figure out my PC solution.
Does that make sense? Anything I might be missing with this approach or any other thoughts you may have? I appreciate the help.