One of these:
- You can run
"C:\Program Files\UrBackup\enable_internet_only.bat"
on the clients - Put server in a separate (virtual) network and only forward internet + web interface
- Block 35623 UPD outgoing on the server with its firewall settings
- The 2.2.x server has a
--internet-only
switch. On Windows add
–internet_only_mode
true
to args.txt
Of course it breaks LAN discovery. But you can temporarily switch LAN mode back on once you have a new client.