I currently have two different domains in my network that I keep separate and give limited access to. For example I have domain abc.ad and efg.ad, abc.ad has access to shares on efc.ad by connecting with a domain users credentials and it works. Now I am running into a problem with my backup software because the backup software is installed in the domain for abc.ad and I am trying to back up servers in the domain efg.ad the problem is that the services that run for the backup software application don’t have permissions to domain efg.ad. I was told that I might need to setup a one way domain trust but I would only want to give a one user access just for the backup. Domain abc.ad is a Windows 2003 server and domain efg.ad is a Windows 2008 R2 server, domain abc.ad only needs to see efg.ad what would be the best way to do this?