In anticipation of the upcoming release of Backdrop CMS, over the weekend I created a video showing how to port a module from Drupal 7 to Backdrop CMS 1.0. The External Links module is a relatively simple module that I wrote a long time ago, but it provides a great demonstration of the basics of porting. It's also a great example to show how the Drupal-compatibility mode, which re-namespaces "drupal" functions and methods to "backdrop", works in JavaScript as well as in PHP. The completely ported External Links module is available on GitHub, alongside the other modules in the Backdrop Contrib Repository.