Nice, I run a proxmox cluster on some AMD Ryzen Mini PCs with fail over. Works amazingly well. Make sure you look into Proxmox Backup Server, it is really nice.
I largely run docker containers, so I use a lot of Restic (w/ Restic Profile) -> S3 with Healthchecks monitoring Backup, Checks, and Pruning jobs.
Proxmox is so easy to setup a cluster but you will need three devices, but one of them can be a Raspberry Pi Zero just to maintain voting quorum (so they don't fight to be in control).
Also check out Proxmox Helper Scripts to get starting up popular apps stupid easy. Although I generally recommend Docker.
My only complaint about Proxmox is the lack of an option for full disk encryption.
Oh cool.. Okay sounds like I have lots to look into. Yeah backups will be important.
I will be using some tools like Prometheus and Grafana for monitoring VMs and containers. But I need to look into those solutions as well.
Did not know about the helper scripts.. okay cool. I will keep that in mind.
Hah yeah I can see how that would be a negative. Hopefully they implement that in the future.