Three two one rule
Keep three copies, on two kinds of storage, with one copy kept somewhere else.
Learn it through a story
- Ranjan Uncle's Backup Diary (Cybersecurity for Juniors 1, Ch 9)
Short on time? Read the 5-minute version.
Related terms
- STRIDE A six-question framework (Spoofing, Tampering, Repudiation, Information disclosure, Denial of service, Elevation of privilege) for threat modeling.
- Threat modeling Systematically asking what could go wrong with a system, and for whom, before or while it's built.
- Threat modelling Asking in advance who could misuse something and what the worst outcome could be.
- TLS certificate A credential proving a server's identity and enabling encrypted connections.
- Too-good-to-be-true offer Something valuable offered for nothing, with no real reason given.
- Trigger The secret signal, like the yellow sticker, that activates a backdoor.