Ok, I just purchased Backup Exec System Recovery 2010 for Small Business Server and it says it will not install on a Domain Controller.
In another post, Chris Riley from Symantec posted response to someone else that he confirmed it cannot be installed on domain controllers. Well, how do you install it? Symantec's Chris Riley post is below.
I've had it confirmed that BESR-MS cannot be installed on domain controllers at this stage. I will be creating a technote so that this is documented.
Sorry I don't have better news for you.