One option: revisions. If you save a large number of revisions for your pages, you can then browse through the revision history and “Preview” what a particular page looked like at a particular point in time. However, this requires whoever is viewing the past view to be logged in, since Previews are not public.
Another option: you can manually save pages one at a time by telling the Internet Archive to index a particular page immediately. To capture a snapshot, you can paste the URL into that site (where it says Save Page Now) and later return to view it at any time. If you’re working on a better-linked-to site, you may find that they already have some snapshots of some of your content.