Adding the batch files to the policy that protects a specific node in the availability group

To add the batch files to the policy that protects a specific node in the availability group

This procedure assumes that you already created a policy and created batch files for a specific node in the AG.
See Configuring an automatic backup policy for a specific node of a SQL Server availability group.
See Creating a batch file for the policy that protects a specific node in an availability group.
Open the policy that you created.
On the Backup Selections tab, add the batch file(s) that you created.
Include batch files for only one type of backup in this policy. (For example, full, full differential, or transaction log.)
Click OK to save the policy.
Repeat the steps in this procedure for each policy that you created.