These pages describe best practices for converting modules and themes from Drupal 7.
For projects built on other versions of Drupal (such as Drupal 6 or 8), it is recommended to convert these projects first to Drupal 7 before commencing conversion to Backdrop.

The Change Records page documents API changes between Drupal 7 and Backdrop. If any unexpected errors or failures arise while attempting a module or theme or layout conversion these pages should be consulted. Most of the time this should lead to answers to resolve the problem; failing this, it is recommended to open an issue in the queue or ask in the forums.