Ansible comes to mind. Used it to orchestrate hundreds of servers with migrations. Could also simply set up proxmox services beforehand if you're truly motivated, then just replicate the server to another instance.
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And all networking configuration and everything else is transferred with close to zero effort?
You could roll your own SDN with the likes of wireguard.
Hello, may I interest you in NixOS? All your config, in one place, build it again and you got a copy. :)