As I mentioned in another thread, the only real protection against ransomware is making periodic backups, secured from direct write access. Whether you do so by disconnecting the cable, powering off, or restricting write privileges to a backup drive.
Though the FBI and Interpol have shut down cryptoware servers in the past, they come back on line fairly rapidly in another form. Most likely as they are making hundreds of millions of dollars with this scam. Which means, they are not going away.