Unit test Open your Moodle instance's root folder using a file browser and make sure that there's no folder that begins with " System_. ". If there's one already, delete it. Open your terminal. Initialise and run PHPUnit: $ php admin/tool/phpunit/cli/init.php $ vendor/bin/phpunit privacy/tests/moodle_content_writer_test.php Or if using MDK: mdk phpunit -r -u privacy/tests/moodle_content_writer_test.php Check the root directory and make sure there is no folder that starts with "System_." Regression test Enable data export requests. Go to Site administration > Users > Privacy and policies > Privacy settings and tick "Create automatic data deletion requests" Log in as a student and go to the profile page (From the user menu in the top right corner). Click "Export all of my personal data" in the Privacy and policies section. Log in as the admin and approve the request. Go to Site administration > Users > Privacy and policies > Data requests. Run cron php admin/cli/cron.php Log in as the student and download the data export (should be a notification with a link at the top). Extract the file and check that all the user information is present, especially files loaded into Moodle.