def get(cls, backend_id):
        """
        Return an instance of backend type
        """

        for backend_class in cls._get_backends_classes():
            if backend_class.id == backend_id:
                return backend_class.create()

        raise InvalidBackendError(
            cls.backend_type,
            backend_id,
            get_installed_pools()[cls.backend_type]
        )
Return an instance of backend type