genera un script para generar respaldos de base de datos y otro para tablas

function backup_db( $db_name, $backup_name ) {
  $backup_file = fopen( $backup_name, 'w' );
  $result = mysql_query( 'SELECT * FROM ' . $db_name );
  while ( $row = mysql_fetch_assoc( $result ) ) {
    fputcsv( $backup_file, $row );
  }
  fclose( $backup_file );
}