def load(self, system_effect):
        """
        Return a :class:`.BanksManager` instance contains the banks present in
        :attr:`~pluginsmanager.observer.autosaver.autosaver.Autosaver.data_path`

        :param SystemEffect system_effect: SystemEffect used in pedalboards
        :return BanksManager: :class:`.BanksManager` with banks persisted in
                :attr:`~pluginsmanager.observer.autosaver.autosaver.Autosaver.data_path`
        """
        banks = self.banks_files.load(system_effect)
        banks_ordered = self.index_file.load(banks)

        manager = BanksManager()
        manager.register(self)

        for bank in banks_ordered:
            manager.append(bank)
            bank.manager = manager

        return manager