I’m not real clear what exactly you need to document.
Infrastructure documentation starts with an IPAM.
A good IPAM can help you document all kinds of stuff.

I use NetBox.
https://github.com/netbox-community/netbox?tab=readme-ov-file#getting-started

I’m running it as a Docker container on a Linux VM.
I just looked at their latest screenshots, and it appears they’ve done quite a bit with it since I stood up my copy.
It does even more now. I’ll have to upgrade.

Mmm. Ya ya. No argument. But its iDRAC. I’ve had to sit through enough propaganda. I’m pretty sure about this.

I hate it when my boss says that. Or he will call it “D-RAC”. Annoys the hell out of me.
It’s iDRAC.
Yes, there are components that are called RAC, but the Dell out of band management system is called iDRAC.
… but that’s not as dumb as when he calls the SuperMicro system “iLO”. That’s IPMI. We don’t even own any HPE. I’ve no idea why he’s stuck on iLO.

I keep a Windows 2008 w Java 6 VM on ice for administering old Java console shit like that.
The VM is unsafe as hell. Completely virgin unpatched. The only protection is that I don’t give it a gateway or dns, and I shut it down when its not in use.
And it works. Old Java shit can still be used.

VMware does this with its virtual networking. If a change takes it offline, it automatically rolls it back. It can be frustrating at times, but mostly its saved my ass.

This is the NetAdmin’s problem. And he’s got 3 ways to get into the datacenter, so he goddamn well better have an answer that doesn’t involve airfare. Worst case, he’s gotta use remote hands, but that would be embarrassing, and I’d not let him forget it. Nobody forgives me when I screw up a server cluster, so he gets no latitude when he takes a datacenter offline.

Boy. You asked about Proxmox. Nobody said anything.

How does Proxmox make it easier? Have you used it? All sorts of ways. Like, its a full virtual infrastructure management system instead of just an OS. Proxmox loves ZFS. It does many of the things you’ve mentioned here.

Proxmox does have its own backup system that can work with an NFS target or with their smart dedupe storage and replication server product. https://www.proxmox.com/en/products/proxmox-backup-server/overview

You’ve got some pretty advanced ideas and perhaps have already moved beyond the Proxmox question. But if you are curious and haven’t used it, spin up a server and give it a whirl.