[spiffytech]

Home safes are available that are fireproof, waterproof, and very durable. Theft is an issue, though.

A bank safety deposit box is a good backup plan for the home binder.

The benefit of the binder over (or in addition to) the secret manager is it maximizes the chances your family can successfully access your data. I've designated family members as the emergency access contacts for my password manager, but one member completely forgot I even used a password manager, or what it was called. They would never have looked for my data there in an emergency.