public function compressGzip()
{
$input = JFactory::getApplication()->input;
$key = $input->get('key', '', 'cmd');
$seek = $input->get('seek', 0, 'cmd');
$options = array('key' => $key);
try {
$backup = new RSFormProBackup($options);
$archive = new RSFormProTar($backup->getPath());
// GZIP compress it.
$seek = $archive->compress($seek);
// Continue with GZIP archive creation
$this->showResponse(array('status' => 'ok', 'step' => $seek ? 'compress-gzip' : 'done', 'seek' => $seek));
} catch (Exception $e) {
$this->showError($e->getMessage());
}
}