Excellent suggestion. Really impressed to read the entire blog because it covered almost everything that one should do when they get victimized by an ransomware. But i have one thing to mention that Petya isn't a ransomware as Matt Suiche did analysis and described in his blog on medium - https/blog.comae.io/petya-2017-is-a-wiper-not-a-ransomware-9ea1d8961d3b. Besides, the ransomware attacks keep increasing and I think the number would be double compared to 2016 so far. We all have witnessed Wannacry, the major havoc. Being small business owner we never knew about such thing until it came to picture early this year. I read couple of articles about it one really helped me gaining knowledge about it is http/gotowebsecurity.com/know-everything-ransomware/ which described everything in detail like you did. It also suggest prevention. Few people are writing for cause. Its good to read out and get some knowledge out of it.