Google Apps Script - Delete old files from a folder in google drive

google apps script deleteOldFiles

//
// From source: https://blog.ss88.us/delete-files-from-google-drive-folders-after-x-days-apps-script
//
function DeleteOldFiles() {
  var Folders = new Array(
    'FOLDER_ID_HERE',
    'FOLDER_ID_HERE'
  );
  var Files;

  Logger.clear();

  for (var key in Folders) {
    Folder = DriveApp.getFolderById(Folders[key])
    Files = Folder.getFiles();
	
	Logger.log('Opening Folder: ' + Folder.getName());

    while (Files.hasNext()) {
      var File = Files.next();

      if (new Date() - File.getLastUpdated() > 7 * 24 * 60 * 60 * 1000) {
        File.setTrashed(true); // Places the file in the Trash folder
        //Drive.Files.remove(File.getId()); // Permanently deletes the file
        Logger.log('File ' + File.getName() + ' was deleted.');
      }
    }
  }

  if(Logger.getLog() != '')
    MailApp.sendEmail('YOUR_EMAIL_ADDRESS', 'Backups have been removed from Google Drive', Logger.getLog());
}