def create_backends_from_settings(self):
        """
        Expects the Django setting "EVENT_TRACKING_BACKENDS" to be defined and point
        to a dictionary of backend engine configurations.

        Example::

            EVENT_TRACKING_BACKENDS = {
                'default': {
                    'ENGINE': 'some.arbitrary.Backend',
                    'OPTIONS': {
                        'endpoint': 'http://something/event'
                    }
                },
                'another_engine': {
                    'ENGINE': 'some.arbitrary.OtherBackend',
                    'OPTIONS': {
                        'user': 'foo'
                    }
                },
            }
        """
        config = getattr(settings, DJANGO_BACKEND_SETTING_NAME, {})

        backends = self.instantiate_objects(config)

        return backends