It is possible to export your WordPress site and thus save your work from becoming lost. You can use this feature as a periodic backup or if you can save your website content for post-graduate use–after your site has been taken down by St. Olaf.
To export your site, go to Tools->Export, select what you wish to export, and press Download! Alright, that was pretty straight forward, way to go!
If you wish to use some of your content on a wordpress.com (as opposed to stolaf.edu) you can import the file you just exported from Tools->Import. However, this does not replace your CIS Portfolio. This is just a way to continue hosting your site after you leave St. Olaf (and it can be prone to error).