Migrating to Drupal 9: When You Need to Do It and What the Process Looks Like
Major Drupal-to-Drupal migrations are soon going to be a thing of the past, because of the easy upgrade path that has been established with Drupal 8. However, Drupal remains one of the most popular Content Management Systems (CMS) for very good reasons, and there will always be a need for migrations for sites with a lot of content coming from forlorn CMSes, or from proprietary systems that cost an arm and a leg and lack the flexibility that Drupal provides.