How to Protect Your Mac Against Ransomware

Time Machine, FileVault, software updates and Privacy & Security settings that block Mac ransomware.

6 min read · Beginner friendly

1. Run Time Machine continuously

1. Plug in an external SSD (at least 2× your Mac's storage)
2. System Settings → General → Time Machine → Add Backup Disk
3. Enable Back Up Automatically
4. Optionally add a second cloud backup (iCloud, Backblaze) for protection if the external drive is also encrypted

2. Enable FileVault and Gatekeeper

• Privacy & Security → turn on FileVault
• Set Allow apps from to App Store and identified developers
• Never override Gatekeeper warnings for unsigned apps

3. Keep macOS up to date

Apple ships Rapid Security Responses for ransomware-relevant flaws. Enable automatic updates under General → Software Update.

4. Smart habits

• Do not paste Terminal commands from web pages
• Avoid cracked or pirated apps — these are common ransomware delivery channels on Mac
• Be cautious with email attachments, even from contacts