@in037,
Is it a standalone Exchange server or you have seperate front-end server?
It is recommended to restore from one of your CAS server (or master) and select dag as source/destination.
What do you have define as Client in your Policy?
Could you please send the output of the following command:
bppllist <policyname> (where <policyname> is the name of your Policy)
Did you apply all the pre-requisite like NFS installation on client, organization management roles, start netbackup services as domain user ....
If you know how to backup/rstore with 2010, it should be easy with 2013.
As you backup your passive node , did you setup the preferred list ? it is better to backup from active node because you can miss some data during transaction log commit from the backend (SQL server).