You should not rely on the technique in this article as your “ransomware recovery plan”:
Researchers Quietly Cracked Zeppelin Ransomware Keys – Krebs on Security
If you read the article, you can see that breaking the ransomware encryption is not easy or guaranteed.
Neither should you plan on paying up:
At least have a ransomware resilient back-up if nothing else. Not sure what that is, I have the details of what it should consist of here:
Clive Catton MSc (Cyber Security) – by-line and other articles