Is there a way to disable backup when a VPN is in use?
If its possible - add network to the metered connections and use the Disable Backup over Metered Connections
option in Veeam Endpoint Backup > Settings. However, be advised that its available in Win 8.x and above - Win 7 and server versions simply don’t have the needed API. The detailed description can be found in this blogpost: Veeam Endpoint Backup: Metered connection support
If you want to set this up for Win7 please refer to the solution provided before. Thanks
P.S. I completely forgot that you can add the VPN directly to metered connection – so try to a the mobile network instead.