Anticipating problems.
THE DOMAIN EXPIRING
Auto-renewal, a valid card, and a contact address on a different domain.
The most common serious DNS failure and the most preventable.
LOSING ACCESS TO THE REGISTRAR
Credentials recorded, more than one person with access, registered in the business's name.
LOSING THE ZONE
A zone export, stored off the server.
A MIGRATION GOING WRONG
The old server kept running for a week, and a hosts file test before switching.
MAIL BREAKING
Records noted before any change, and tested afterwards in both directions.
SOMEONE ELSE CHANGING SOMETHING
Two-factor authentication, limited access, and periodic checking.
A DEVELOPER DISAPPEARING
Knowing where the domain is registered and where DNS is held, now.
WHAT TO ASSEMBLE
Registrar details and access DNS provider details and access A zone export Your server's address A contact address that does not depend on the domain
FIVE THINGS, KEPT TOGETHER
That is a DNS recovery kit, and it takes fifteen minutes to assemble.
Most difficult DNS situations are difficult because it did not exist.
