Question: Do you want to keep the blog content for posterity sake or because it is useful information that benefits people? Or a little of both? If for posterity.....up on the web....yeah, that may not be possible without a cost. After you stop paying for the blog hosting, it will be dropped(or maybe not...contact your host).

If you only seek to get a backup copy for yourself, for a momento or keepsake, OR to refrence for rewriting and recycling.......There are services out there. One that is almost like a screenshot of everything up to the time you 'capture' it. So....it depends on what you want, need and plan for the cumulative blog history.

Peace ✌