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I'd say that should work. I do a similiar thing with my proxmox server, I have a second node that I bring up once a week and rep to, and the PBS backups on a different machine get repped internally as well as to a USB drive that is swapped every week and taken offsite.
I've recovered the proxmox server and all VMs, as well as restored individual docker stacks on my docker VMs from this setup.
Test a restore and see. Only way to know for sure.
make me shake ... brrr
I'm going to try and see is I can get a VM running on the second Truenas server using the replicated dataset. I only use the second machine to duplicate datasets in case the first machine fails and have to rebuild it.
That'll do it if all you're checking for is valid working operation after a restore.
Make some notes that you tested it and what you had to do to get it working in the backup job as well. Could save you A LOT of panic in the future.