I have a trusty UnRaid server that has been running great for almost 3 years now, with some kinks and headaches here and there, but mostly very stable. Now I'm entertaining the idea of setting that box up with ProxMox, and running UnRaid virtualized. The reason being that I want to use UnRaid exclusively as a NAS and then run all dockers and VMs on ProxMox (at least that's how I'm picturing it). I would like to know your opinion on this idea. All I have is Nextcloud, Immich, Vaultwarden, Jellyfin, Calibre, Kavita and a Windows VM I use to update some hardware every now and then. I mainly want to do that for the backup capabilities in ProxMox for each instance. Storage is not a concern, and I have 64GB of ECC Ram running in that box. What are the Pros and Cons, or is it even worth it to move all this to ProxMox?
I wouldn't, you'll lose a lot not having it manage the disks such as using dissimilar disks for the array and having it spin down unused disks. You might be able to pass disks through so the unraid VM can manage them directly, but it might be harder than I'd personally want to deal with.
If you aren't running VMs much. Truenas scale I believe can do docker well. I've seen a lot of people put that in a VM on proxmox with disks passed through to be used as the NAS portion.