Backup preferred server group for DAG

In DAG, you select database in selection list. The database selected would have a passive/active server. In Exchange tab, you have an option of selecting whether you want active copy to be backed up or passive copy. If you select active copy there, we will go to the exchange server which has active copy of database and back it up. If you select passive copy there, we will backup whichever server has the passive copy. Now, in your scenario you have two servers, where you are left with not much choices. All you have is one active and other passive in terms of each database. Preferred server would be applicable when you have more than one passive copies available as choice. Then, if you select passive copy to be backed up from Exchange tab in backup job properties, you have the option of specifying one of the passive servers in the preferred servers node.

So, I would suggest for your setup, you dont need the option of preferred servers, instead look at the options available under Exchange tab in backup job properties. That is sufficient for a two node setup.

I hope that answers your question, if it does mark it a solution.

Thanks