The Migrate Drupal module allows you to upgrade an existing Drupal 6 or Drupal 7 site to Drupal 8. The Migrate Drupal UI module provides a browser user interface for these upgrades.
If an upgrade has already been performed, and there is new or updated content on the source site, then the site administrator may want to migrate only this content. This is called an incremental upgrade.
Incremental upgrades are now possible from the browser, using the Migrate Drupal UI module. There is now a button to start an incremental upgrade. Previously, this could only be done using the Drush user interface. Now it is also possible using the browser user interface.
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