This has developed suddenly on two servers connected by a 100Mb connection between buildings.
Log Name: DFS Replication
Date: 12/11/2022 21:00:25
Event ID: 5014
Task Category: None
The DFS Replication service is stopping communication with partner DC0 for replication group Domain System Volume due to an error. The service will retry the connection periodically.
Error: 9036 (Paused for backup or restore)
Connection ID: 1FD17D3D-1EB1-4C54-A919-0CB62D200075
Replication Group ID: 329E9E69-8D98-4557-B2AA-4C3E4455A3C3
Domain System Volume
Paused for backup or restore