public Updater::getBackupDir()
Returns the full path to a directory where backups should be written.
public function getBackupDir() { return \Drupal::service('stream_wrapper_manager')->getViaScheme('temporary')->getDirectoryPath(); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Updater!Updater.php/function/Updater::getBackupDir/8.1.x