As of April 5, Drupal 7 will have nine months before it’s entirely unsupported and becomes a liability. Migrating out of Drupal 7 can be complicated, and this is one reason many organizations have put it off for so long. While it’s true that Drupal 8 and beyond represent a radical change from Drupal 7, in everything from architecture (the introduction of Symfony components) to theming (Twig versus PHP), the path from Drupal 7 to now Drupal 10 is well trodden, and we’re very familiar with it at Chapter Three.

Because Drupal 7 has been around for well over a decade, many websites built on it have accumulated vast amounts of content, resulting in complex data structures with custom content types, fields, taxonomies, and entity relationships. Inconsistencies or irregularities in legacy data complicate the migration process.