Try this too,

 - Keep your Joomla Uptodate with its extensions.
 - Keep regularly back of your site in [clouds][1].
 - Do not open `robots.txt` for secured folders.
 - For latest Joomla version two-factor authentication will more secure.
 - Make sure folders and files have right permission allowed.
 - Use Cloudfare for [Joomla][2].

Hope its helps..

 

 


  [1]: http://extensions.joomla.org/extensions/access-a-security/site-security/backup/25698
  [2]: http://extensions.joomla.org/extensions/core-enhancements/performance/content-networking/16320