I wanted to test BET2 with backup to VBR server, but B&R 9.5 is not out yet. So I tried again to NFS and failed yet again. This was my last attempt, sorry to say but I'm done testing and failing.
I might try again when B&R 9.5 is out.
NFSSTAT on NFS server:
Sadly the screenshot of NFSSTAT on client failed.