conf files live in /etc/pve/
disk images live wherever you put them, have a look at /etc/pve/storage.cfg
when I moved from my 3 node cluster to a single server, I shut down the VMs and rsync'd just the configs over because all my VMs were on shared storage. I mounted the shared storage on the new server with the same name so that when I moved my conf files over, the VMs would just work.