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What is the 3-2-1 backup rule?

  1. A Three copies, on two media types, with one off-site
  2. B Three backups per day over two weeks
  3. C Three servers, two sites, one administrator
  4. D Three full backups and two incrementals
Answer

Three copies, on two media types, with one off-site

It survives hardware failure, site loss and most ransomware. Modern practice adds an immutable or air-gapped copy.

All IT operations MCQs

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