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If your CMS has a server-side cache, there may be little if any point in doing this, though. Generally, though, a CMS won't cache pages for logged-in users, since pages could vary from user to user. (A really smart CMS would cache pages for logged-in users as well - you'd have to be careful to avoid unique per-user/per-visit content.)
If your CMS doesn't have this option, you will need to use a tool that can capture the HTML from your site, which you can then upload to a static site (or static section of your site). HTTrack is a good starting place.