SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/sec-test-backups

What should you do regularly with your backups, according to CISA?

Test that they work in a recovery scenario.

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  1. Delete the oldest copy
  2. Test their availability and integrity ✔
  3. Rename the files

Why: A backup you have never restored may be empty, corrupted or missing key files. A regular test shows it works before a real emergency.

Huh, didn't know that: NCSC says it's important you know how to restore a backup and check that it contains all your important data.

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Why did the computer show up at work late? It had a hard drive.
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References

Answer: Test their availability and integrity. A backup you have never restored may be empty, corrupted or missing key files. A regular test shows it works before a real emergency.

  1. CISA: #StopRansomware Guide www.cisa.gov/stopransomware/ransomware-guide
    regularly test the availability and integrity of backups in a disaster recovery scenario
    Checked 2026-10-10.
  2. NCSC: Backing up your data www.ncsc.gov.uk/collection/small-organisations-guide-to-cyber-security/backing-up-your-data
    it's important you know how to restore it
    Checked 2026-10-10.

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Test yourself in the game

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That's stuff everyone should know.