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With Proxmox it's quite easy, you can copy the VM/LXC Backups to the new host (via SCP, NFS or whatever) and restore there. Recently did exactly that.
Sounds pretty straightforward. Thanks for the info!
You could even just create a cluster and do a migration. I don't think you need zfs for that, you only need zfs for replication.
Should work indeed, but they'd need replicated space. I'm not sure how well that works if the cluster is only designed to be temporary, since removing a productive node from a cluster is a bit risky?
Good callout. Just did some reading on the concept of maintaining a quorum, which I didn't know about. Definitely need to be careful if I go with that approach, but it does sound interesting! I'm not entirely opposed to leaving the old laptop as a node and then using it for experimental stuff or maybe running just one specific standalone service on it after moving the critical stuff to the new server.
You don't need multiple devices and quorum unless you're using HA. I have two nodes just so I can migrate back and forth when doing updates instead of shutting all the VMs down. No quorum, no HA.
Oh, nice! Thanks for explaining that. I didn't realize there was a way to run a cluster without HA.
I edited, since it was ambiguous. I think you only need zfs if you want replication, cold migrations should be fine without it.
Removing nodes from clusters is fine. It's not really encouraged, but if a node fails you have to be able to remove it, so it's possible.