Your existing D6 or D7 web site remains utterly unmoved and intact..!
Although you would possibly hope or expect that your new D8 website are going to be basically identical as your previous site, with the additional advantage of D8's new and improved options, that will not be the case.
Migrations in Core
Drupal 8 includes two core modules:
Migrate - A base module for creating your own custom migrations. This module provides the core migration architecture, but does not define any usable migrations itself.
Migrate Drupal, a module containing migration definitions and source plugins for migrating content from Drupal 6 to Drupal 8. This will eventually support Drupal 7 as well.
Drupal 8 includes a robust constitutional migration system for importing content into your website. it's designed to handle information from Drupal 6 or 7, and far a lot of. it's built around a plugin-based design, that permits importing of information from any external data supply if you write your own supply plugin.
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