Sorry, I tend to “jump”.
After getting stuck with the legacy version, I upgraded to 2.0 (which was now available).
The problem was the same, so I didn’t update the screenshots.
When I open the client I have to choose my Roon Core whichever is found.
The next window is the login screen. Here I can choose the option of backup.
After the update is complete, a reboot is required. Here comes (after resetting the NAS) the message that the client is waiting for the Roon Core.
After this restart, “Connection failed” appears
And I’m definitely in the right network with the right IP range.
When I reconnect, I’m back to square one with no backup in place.
After going wired, resetting the NAS, trying different routers, changing network cards…
The NAS works, I can see the traffic during the backup and also the network traffic. What I can’t verify is if the core actually has a connection the whole time.