I currently have Microsoft Data Protection Manager set up a one location on domain A. I am looking to protect domain B (at another location). I have a VPN setup and DNS forwarding as well as a two-way active directory trust in place. I think I could have the DPM agent use the VPN to backup the data, but this seems like it may be inefficient. Is the VPN my best or only option or is there a better way? My concern is to use my bandwidth efficiently because each location only has a 2Mb internet connection.