Useful Extensions
Code highlighting - http://extensions.joomla.org/extensions/core-enhancements/coding-a-scripts-integration/code-display/16157
Site backup - http://extensions.joomla.org/extensions/access-a-security/site-security/backup/1606
EU Cookie - http://extensions.joomla.org/extensions/site-management/cookie-control/21382
Sitemap - http://extensions.joomla.org/extensions/structure-a-navigation/site-map/3066