Make sure that you regularly make offline back-ups of all of your computers, phones, or other devices. Disconnect them backups—both virtually and physically—from your main systems. Use high-quality antivirus and anti-malware software appropriate to your devices and make sure to enable automatic updates on them. Make sure your devices have the latest operating software updates and set those updates to load automatically if you can. Use two-factor authentication when possible. This means the hacker would need more than just your password and user ID to access your system—he would also need something like a one-time code that is sent directly to your phone.