- Basic security practices to keep malware from working: applying the latest security updates, giving users the least amount of access and privileges they need to do their work, firewalls to contain the spread of malware within your network, anti-virus software, strong passwords, etc.

- Educate employees not to fall for phishing e-mails.

- Having up-to-date off-site backups so that if your systems do get compromised, you can restore your systems and get your data back without having to pay ransom.