Ransomware

Ransomware is malicious software that locks or encrypts your files and demands payment to give them back.

What it means for you

CISA recommends offline, encrypted backups that you test regularly, because ransomware often looks for backups it can reach. An external drive that is unplugged after each backup helps reduce risk.

Guides on this topic

• Home Backups: the 3-2-1 Rule, Free Options First

  Back up photos and files with Time Machine or Windows Backup, add an offsite copy and keep one copy offline to help reduce ransomware risk.

• Password Managers for a Household: Free Options First

  Start with the free built-in managers from Apple and Google, then compare free Bitwarden and Proton Pass plans, plus breach alerts and a weekend plan.

• Local vs Cloud Storage for Security Cameras

  microSD, hubs, NVRs and cloud plans compared, and which to choose.

Related terms

• 3-2-1 backup rule
• Phishing
• NAS
• Firmware

← All glossary terms · Search all guides for “Ransomware”

Definitions are short and general. For model-specific details, check your device maker’s own documentation.