In an Edge for Private Cloud installation of the Developer Services portal, you might get a notification that a new version of Drupal is available.
A new version can mean a Drupal feature release, patch, security update, or other type of Drupal update.
NOTE: When you upgrade Drupal from 6.x to 7.x, the official instructions on say to disable all non-core modules.
However, we recommend that you do NOT disable Civi CRM.
Do not perform a major version upgrade from within the original site.
You can also use Drupal VM with Composer, a Drush Make file, with a Local Drupal codebase, or even a Drupal multisite installation.
If you want to install a Drupal 8 site locally with minimal fuss, just: But Drupal VM allows you to build your site exactly how you like, using whatever tools you need, with almost infinite flexibility and customization! You can also use an alternative provider like Parallels or VMware.
If you have a Drupal 6 site that you want to upgrade to Drupal 7, create a new Drupal 7 site and add content, files and modules into the new site.
If you are upgrading from Drupal 6 or Drupal 7 to Drupal 8, create a new Drupal 8 site and add content, files and modules from the old site there.