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I just
rsynca full backup of my NAS's entire RAID array every week to a separate machine. I have Proxmox set up with an NFS mount to the NAS where it stores all of the/[userdata]volumes that my VMs and LXCs use; Proxmox itself is hosted on 3x office PCs, each with i7-7700/500GB SSD/32GB RAM, and set up for replication in case one goes down. On occasion I'll actually document which services I'm using, so I don't really bother backing those up since the volume(s) holding the userdata itself is backed up and can be easily remapped to a new instance of whatever service needs it.Most of what I would use proxmox for doesn't even require backing up. A copy of each VM when it is setup and possibly update that every few years would be plenty.
I think you can export the whole VM? Using virtualbox currently which has import/export appliance. Doing that on an infrequent basis is pretty much what I would need.
Proxmox has backup stuff for VMs and containers which uses whatever storage youbadd (local, NFS,), and has retention settings. iirc those will always be full backups. for incremental and more, proxmox backup server (PBS VM using backupNAS as destination for me)