Its very handy to back up the content from a site

• for piece of mind
• to allow migration (or bulk editing?)

It would be even greater to add the following benefit

• access the content offline via any browser

it would be as simple as, when creating each .txt file in source folder, also put a .html file in another folder by reusing the core of your rendering code. If it makes it any easier you can leave off all styling and navigation panes, just leaving in-text relative hotlinks