Exchanging VM's with other proxmox servers

[Jos Chrispijn]

I currently am running a BSD VM and would like to have that system 
maintained by a fellow proxmox user.
So he can login to that VM and do his stuff.
But would it be possible that he just downloads a backup of the VM, 
install it on his proxmox, alters it and send a backup of that back so 
that I can 'restore' is for  operation?

Best regards,
Jos Chrispijn