When the SnapManager MMC snap-in is connecting to the Database Availability Group (DAG), you can view all the reports from all the member servers of the DAG.
The report folders reside on each member server of the DAG. The report folders for the DAG reside on the "owner node" of the DAG. Whenever configuration, backup, or restore operations are performed, the reports generated for the DAG are stored in the report folders of the server which is the owner node of the DAG at the time these operations were performed.