Check for error with specific text

store/store.go

@@ -1217,8 +1217,11 @@ func (s *Store) Backup(br *proto.BackupRequest, dst io.Writer) (retErr error) {
 			}
 		} else {
 			// Snapshot to ensure the main SQLite file has all the latest data.
-			if err := s.Snapshot(0); err != nil && err != raft.ErrNothingNewToSnapshot {
-				return fmt.Errorf("pre-backup snapshot failed: %s", err.Error())
+			if err := s.Snapshot(0); err != nil {
+				if err != raft.ErrNothingNewToSnapshot ||
+					!strings.Contains(err.Error(), "wait until the configuration entry at") {
+					return fmt.Errorf("pre-backup snapshot failed: %s", err.Error())
+				}
 			}
 			// Pause any snapshotting and which will allow us to read the SQLite
 			// file without it changing underneath us. Any new writes will be