Although we're doing our best to avoid this trouble, we setup our service in a way that if it does happen, your pages will always render your last content. Behind the scene, we use Cloudflare CDN to serve your content. The other benefit is that we serve it from the nearest location close to your server.
For now, we only target Heroku users. However, we plan to open our service to applications hosted anywhere. If you really want to use our editor and your application is not on Heroku, contact us, we'll figure out something.
At any time and thanks to our RESTful API, you can retrieve the content you added/modified through our editor.