MDL-49298 backup: Make tgz file format standard for backups

admin/settings/development.php

@@ -18,15 +18,6 @@ if ($hassiteconfig) { // speedup for non-admins, add all caps used on this page
     $enablecssoptimiser->set_updatedcallback('theme_reset_all_caches');
     $temp->add($enablecssoptimiser);
 
-    // Backup archive .mbz format: switching to .tar.gz enables larger files, better
-    // progress reporting and possibly better performance. This is an experimental
-    // setting but if successful, should be removed and enabled by default in a future
-    // version. Note: this setting controls newly-created backups only; restore always
-    // supports both formats.
-    $temp->add(new admin_setting_configcheckbox('enabletgzbackups',
-            new lang_string('enabletgzbackups', 'admin'),
-            new lang_string('enabletgzbackups_desc', 'admin'), 0));
-
     $ADMIN->add('experimental', $temp);
 
     // "debugging" settingpage