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Research · 9 Oct 2026

The continuity archive: what to save and how

A practical plan for keeping the knowledge needed to rebuild science and medicine if online services disappear.

If the internet were gone tomorrow, the question would not be whether knowledge existed, but whether anyone could still read it. The continuity archive is the answer: a short, ordered plan for keeping what matters, in a form that survives.

The idea

  1. Choose what matters, in order: what keeps people alive, what rebuilds tools, what rebuilds science.
  2. Keep it in open formats that any computer can read: plain text, PDF, HTML, Kiwix archives.
  3. Keep the reader with it.
  4. Copy it, to more than one place, and check it.
  5. Renew it every month, because the archive changes and drives do not last forever.

What to keep

The Downloads page lists, with the newest release of each file: Wikipedia and its science, medicine and computing editions, Wikibooks and Wikiversity, open university textbooks, Stack Exchange archives for physics, mathematics, chemistry, electronics, engineering, biology, aerospace and software, repair and farming guides, maps, an operating system with its source code, and the scientific reference datasets that are free to take.

How to keep it

  • Two copies on two different kinds of media in two places.
  • Verify each file against the published SHA-256 sum when you copy it, and again once a year.
  • Label drives with what they hold, the date and the release.
  • Store dry, cool, away from strong magnets and from power surges. Test them by opening a few pages with no internet.
  • Print the essentials.

Custodians

People who take on the duty of custodian commit to downloading the complete set every month, keeping two verified copies in two places, and replacing what has a newer release. A calendar reminder for the first day of each month is on the Downloads page.

Why a monthly rhythm

Knowledge that is not renewed decays: archives gain corrections, new editions replace old, links die and drives fail. A fixed monthly habit keeps a small group of people always holding a recent, complete copy, and the rest of the world can copy from them.