function firebaseBackup() {

  var folderID = ‘<GOOGLE-DRIVE_FOLDER_ID>’;

  var date = Utilities.formatDate(new Date(), ‘GMT’, ‘yyyy-MM-dd’);

  var firebaseDb= UrlFetchApp.fetch('https://<YOUR-DB>.firebaseio.com/.json?format=export');

  DriveApp.getFolderById(folderID).createFile(date, firebaseDbTXT)

}