The knowledge vault

The parent page's last line is the whole point of it: redundancy in people, not just gear, is the final layer. That is correct and it is a difficult instruction to act on, so this page is mostly about how.

The single point of failure

Every household has one person who knows how things work, and that person cannot see the problem.

Where the stopcock is. How the boiler is restarted. Which breaker is the kitchen. What the wifi password is. Which of the tins are the good ones. What the plan actually is. All of it lives in one head, and the household functions perfectly right up until that person is the one who is ill, away, or the casualty.

This is the real content of the parent page's warning, and the test for it is uncomfortable and quick.

Ask the question out loud tonight: if the person who normally sorts things out were unavailable for a fortnight, what would stop working? Then write the answers down, because that list is your actual vault, and it is more specific than any book.

The commonest items on it:

• Where the stopcock, gas control and consumer unit are.
• How to restart the boiler or the heating.
• What is insured, with whom, and the policy numbers.
• Which accounts pay which bills.
• Where the documents are.
• The passwords, and how to get into the password manager.
• Who the neighbours are and which of them helps.
• How the generator, the stove or the filter actually works.

Half of that is a sheet of paper in the document pouch. The other half is the next section.

How to actually hand a skill over

Reading about it does not transfer it. Watching does not transfer it. Doing it once, unaided, does.

The pattern that works is old and it is four steps.

1. They watch you do it, while you say what you are doing and why.
2. You do it together, with them handling the tool.
3. They do it while you watch, and you say nothing unless it is going wrong.
4. They do it alone, and you are not in the room.

Step four is the one that gets skipped and it is the only one that proves anything. Until somebody has lit the stove with nobody watching, they cannot light the stove.

One person, one skill, one month. That cadence works where a plan to teach everybody everything does not. Twelve months of it and a household has genuine redundancy in twelve things.

Let children have real ones. Not pretend jobs. Lighting the camping stove under supervision, purifying water, working the radio, reading the meter. The family-specific page is right that this converts fear into competence, and the side effect is a second person who can actually do it.

And teaching exposes what you do not know. The person who tries to explain how the filter works discovers what they have been guessing. That is a benefit, not an embarrassment.

What to print, and what not to bother with

The app has a print pack for this reason. Printing everything is a waste of paper and attention; the useful list is short.

Not worth printing: general reading, anything you would only browse, and anything that changes often. That is what the app and the shelf are for.

Print double-sided, put it in a plastic wallet, and keep it with the document pouch. Then reprint the plan card whenever a number changes, because an out-of-date card is worse than none, as the children's tier says: it gets tried first and wastes the attempt.

The formats, ranked by what survives

Nothing here is permanent, and knowing the decay order tells you where to put the copies.

1. Paper, kept dry. Decades, readable by anybody, no dependencies. The only format with no failure mode except fire and flood, which is why it goes in a different building from the digital copy.
2. The app, installed offline on a phone. Excellent, searchable, always present, and it depends on a charged working device.
3. A Raspberry Pi with Kiwix. Enormous breadth, and it depends on power and on somebody maintaining it.
4. USB flash drives. Convenient and the least durable thing on this list. Unpowered flash memory can lose data over years, so treat them as copies to refresh rather than as an archive.
5. Cloud storage. Effortless while everything works, and it is the first thing that is unavailable.

So: two USB sticks as the parent page says, and at least one printed copy of the short list above, in a different place from the sticks. Refresh the sticks annually, at the same time as the water rotation, and test that they still read.

Test the restore, not the backup. A backup nobody has ever opened is a hypothesis. Open one a year, on a different machine, and see whether it actually works.

The four knots, and why those four

The parent page says learn six and names four good ones. Four is honestly enough, and each covers a category rather than a trick.

• Bowline. A fixed loop that does not slip and unties after loading. Anything you need a loop for.
• Taut-line hitch. An adjustable loop that grips under tension. Guy lines, tarps, anything you tension and retension.
• Trucker's hitch. Mechanical advantage for hauling something tight, then locking it. Loads, tarps, washing lines.
• Square or reef knot. Binding two ends around something. Bandages, bundles, parcels.

Add a clove hitch for attaching a line to a post quickly, and you have covered essentially every household rope task.

Learn them on a real rope, in the dark, one evening. They take an hour to learn and about ten minutes a year to keep. And teach one other person, which is the whole subject of this page.