code: public function unsynchronize()
  	{
  		if (!file_exists($this->strRootDir . '/' . $this->strFolder . '/.nosync'))
  		{
  			System::getContainer()->get('filesystem')->touch($this->strRootDir . '/' . $this->strFolder . '/.nosync');
  		}
  	}
docs: Unsynchronize the folder by adding a .nosync file