3-2-1 rule
A backup guideline of 3 copies, on 2 storage types, with 1 copy kept physically separate.
Learn it through a story
- The Ransomware Email to the Placement Cell (Cybersecurity for Juniors 2, Ch 9)
Related terms
- .gitignore A file that tells Git which files and patterns to never track or upload.
- Advance-fee fraud Paying a small amount upfront for a bigger reward that was never going to arrive.
- Adversarial example An input changed slightly, often invisibly to people, to fool an AI.
- Adware Malware built specifically to flood a device with unwanted ads.
- Agentic AI An AI system that can take real actions, not just generate text responses.
- AI supply chain attack Tampering with a model, dataset or code library before people download and use it.