Why do hackers still launch ransomware attacks, if people and companies make back-ups of their files and can restore the files without paying money to get their files back?

To prevent a WannaCry-style ransomware attack on your network, you can take the following steps:

1. Keep your operating system and software updated with the latest security patches.
2. Use reputable antivirus software and enable firewalls to protect your network.
3. Implement strong password policies and consider using multi-factor authentication.
4. Backup your data regularly and store backups offline or offsite.
5. Educate employees on phishing awareness and safe computing practices.
6. Disable unnecessary services and protocols to reduce the attack surface.
7. Monitor network traffic for suspicious activity and consider implementing intrusion detection systems.
8. Segment your network to limit the spread of ransomware in case of a breach.
9. Consider implementing application whitelisting to control which programs can run on your network.

10. Develop and regularly test an incident response plan to quickly respond to and recover from a ransomware attack.