def METHOD_NAME(self, source_nn_path: str) -> None:
    """
    Copy the .nn file at the given source to the destination.
    Also copies the corresponding .onnx file if it exists.
    """
    final_model_name = os.path.splitext(source_nn_path)[0]
    if SerializationSettings.convert_to_onnx:
        try:
            source_path = f"{final_model_name}.onnx"
            destination_path = f"{self.model_path}.onnx"
            shutil.copyfile(source_path, destination_path)
            logger.info(f"Copied {source_path} to {destination_path}.")
        except OSError:
            pass