Thank you all for the support!
I’ve followed this tutorial (series).
I’m, looking for something stable and TrueNAS seams not to be what I’m looking for. I wanted proxmox because it is better for virtualization in general (what I’ve been told at least). So I can install different VM’s, including TrueNAS. Probably I will try with OMV on Proxmox, now it is running on a PI with two HDD, one syncing to the other. The same setup on a different location, with one HDD also syncing to Site A, as a additional source/backup.
Since I’m at the beginning, I can give TrueNAS a try directly on the Home Server (no proxmox) on Site A, and use it for virtualization too, but only if you guys are telling me, it is stable like OMV and it works with VM’s good.