Barracuda SMB share backup

Thanks in advance for any help here. 

I am trying to backup our Barracuda Message Archiver. Looks like you can access the Barracuda as an SMB share with credentials, but I cannot seem to find a way to backup, using Netvault (without a plugin). I could use a script to copy it to another location, then use Netvault to backup that, but don't want to waste time or space.