From time to time I do backup of all messages. Due to unknown reasons the program says that the export is completed after 1 sec. despite I have > 10GB database in the Live folder. Before I took up to 10 minutes to complete. Is there a manual way to restore WL?

From time to time I do backup of all messages. Due to unknown reasons the program says that the export is completed after 1 sec. despite I have > 10GB database in the Live folder. Before I took up to 10 minutes to complete. Is there a manual way to restore WL?