While including a new node the controller somehow failed to include properly and skipped a node number. I read in another thread that the controller would go back to the next free node number if you did a backup and restore so i tried to backup and immediately restore the configuration + topology.
( https://forum.z-wave.me/viewtopic.php?f=3419&t=24780 )
This failed with the following error message:

Trying to include a new node the controller chose an existing node number so I think the configuration got wiped. If I restore without including the topology the restore succeeds but does not recovery any node information. I tried doing a factory reset and restoring again but I'm unable to get the node information back.
Is there any log file with more details about the failure? I don't see anything relevant in /var/log/z-way-server.log