WP Super cache for WordPress comes at a cost – extensive disk usage

My installation is taking over 1 GB

I've set

cache timeout at 1800 seconds
and scheduler at 600 seconds

You can also turn on compression through "Advanced" tab > miscellaneous

USE THESE SETTINGS: http://www.rackspace.com/knowledge_center/article/using-wp-supercache-to-optimize-wordpress-on-cloud-sites

Also these: http://www.wpwebhost.com/wp-super-cache-optimal-settings-tips-and-configuration/