try

Signed-off-by: Yuji Ito <llamerada.jp@gmail.com>

Author: llamerada-jp

internal/controller/replication.go

@@ -182,7 +182,13 @@ func (s *SecondaryServer) CreateOrUpdateMantleBackup(
 		}
 
 		backup.Finalizers = backupReceived.Finalizers
-		backup.Annotations = backupReceived.Annotations
+		if backup.Annotations == nil {
+			backup.Annotations = map[string]string{
+				annotRemoteUID: remoteUIDReceived,
+			}
+		} else {
+			backup.Annotations[annotRemoteUID] = remoteUIDReceived
+		}
 		backup.Labels = backupReceived.Labels
 		backup.Spec = backupReceived.Spec
 		return nil