I'm investigating options, and my need is to send back-ups to
separate storage servers in a round robin fashion. Typically only one
of them will be connected at a time.
What about configuring the multiple storages and just specify them accordingly in the schedule?
Run=Differential Storage=srv1 monday at 20:00
Run=Differential Storage=srv2 tuesday at 20:00
Run=Differential Storage=srv3 wednesday at 20:00
It's not an automatic round robin but I think its the possible / reasonable.
You could alternately try IP load balancers, but I whink would be a mess trying to restore files / read from specific volumes.