If your back-up and incident response plan is completely useless, you could always fall back on just paying the ransom that the cyber criminals demand. A Sophos study showed 46% of businesses did this:
Study: 90% of organizations say ransomware impacted their ability to operate | TechRepublic
But this study also showed that ransomware attacks are on the increase and that their complexity is increasing. If you have not taken steps to know how this ransomware can get into your organisation – and what you and your team need to do to stop it getting in, then now is your chance:
Social Engineering and Email Cyber Security Training – Octagon Technology
Just one more thing to remember – if you choose to deal with criminals and pay them, they may not keep their word and release your data. After all they are criminals!
Onyx ransomware cybercriminals trash files larger than 2MB • The Register
Clive Catton MSc (Cyber Security) – by-line and other articles