So excited to announce my first drupal to backdrop module port redirect. You can find it, download it, and install it on your backdrop install here: https://github.com/backdrop-contrib/redirect
Of course special thanks to the drupal authors and maintainers of the drupal redirect module.
Working on this port was great fun and a great learning experience! If you want to work on a port you can find some guidelines and a nice video over at https://api.backdropcms.org/converting-modules-from-drupal. You can also get great general info at Backdrop CMS API