Prerequisites
Verify if you have complete the prerequisites.
For Backup:
- Configure required databases under Availability groups.
- Install Agent for Microsoft SQL Server on all replicas of AAG.
For Restore:
- Remove the database to be restored away from the Availability Groups. For more information, see link.
- Delete the database from all replica servers. The database (which is removed from AAG from Primary Replica) is in Not synchronized state at other replica servers.