Below are the two steps you need to take to export your Illinois Wiki site.

Additional documentation can be found from the Confluence Export Documentation: https://confluence.atlassian.com/conf613/export-content-to-word-pdf-html-and-xml-964960309.html 

1) If you are a space admin, you will have a gear icon in the lower left corner of a wiki space  (refer to the gear icon below)

   OR 

2) Click Content Tools and choose one of the export options. Please select the XML export option.