One of the 150+ additional enhancements of Veeam v8 is Preferred networks selection.:-
Enables the selection of preferred networks for multi-homed backup proxy and backup repository servers. This helps to ensure the backup and replication traffic is transferred over dedicated backup networks, without impacting the production network.
For those of you looking for this little gem of a feature, you need to look at the settings of your proxy.
No longer a need to muck around editing local host files. Great news, a little hidden away, but handy to know.