Notes

Things worth writing down once and linking to afterwards.

• A small backup checklist

  2026-07-08 · Five questions to ask about any backup before you need it.

• Automating TLS certificate renewal

  2026-05-20 · A short checklist for renewing certificates without surprises.

• How DNS caching actually works

  2026-03-12 · Why a DNS change does not “propagate”, and what to do before a migration.