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That depends on what level of HA you want to end up with.
If you want proper HA, you'll want to plan on adding a (small, like a Raspberry Pi) third node for quorum. If you are already taking backups and you just want "I can restore on the second system" then it's slightly simpler, but mostly the same process:
If you're planning on proper HA, I'd strongly advise having the proxmox installation on a second small drive on each node and leaving your 1tb drives as data only.
This article half-explains one option for a two node setup (zfs replication), which is functional but not ideal. If you want to get your feet wet with Ceph then I can give you some pointers.
Yeah, but these little Optiplex machines only take one NVMe at a time I think. In your article it sounds like you have a tiny NVMe drive for Proxmox and an SSD (on the SATA port presumably) for the storage. Is this right? I think the Optiplex 5070 allows both NVMe and SSD at the same time, but not 100% sure.
I personally would go the other way, use your nvme for storage and have a second small drive for proxmox since that part doesn't really need speed. That said, if you go with zfs replication it doesn't matter; just have the one nvme drive that holds the proxmox install and the storage pool. Separate drive only matters for Ceph.