Protecting a Mac from ransomware
Ransomware locks your files and demands money to unlock them. It's less common on Macs than on some systems, but the way to defeat it is the same everywhere: make sure you can restore your files without paying.
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Your best defence is a backup
If your files are safely backed up, ransomware loses its power, you simply restore and move on. Set up Time Machine to an external drive and turn on iCloud for your important folders, so you always have a recent copy. There is a full backup guide in the Device & System section.
Keep one backup disconnected
Ransomware can only reach drives that are connected. Keep at least one backup that isn't always plugged in, such as an external drive you connect for backups and then unplug, so a copy is always out of reach.
Reduce the chance of it landing
The same habits that stop other malware stop ransomware: keep macOS updated, only install trusted apps, and don't open unexpected attachments. Together with a solid backup, that's a strong defence.
If it happens
Don't pay, there's no guarantee you'd get your files back. Disconnect from the network, and restore your files from a clean backup. If it's a work device or sensitive data is involved, get proper help before wiping and rebuilding.
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