Our service works with GitHub OAuth and is dependent on the GitHub API. That is why it is not possible yet to restore or access your backups in case GitHub is not available. You can check the GitHub API status over here.
The good news is that we are working on a solution for that. We are planning to implement a GitHub independent login with a recovery password to be set in your account settings. You can then download a ZIP of the repository files or clone the repository via https.