[TheDong]

You may have missed the point of the question. All my machines (business and servers) are currently linux because I know how to update and secure linux.

The parent poster is arguing for diversity for the sake of it. To me, moving from my linux monoculture to a linux+windows diaspora seems less secure.

I'm talking specifically about the idea of security through diversity, not about this specific incident, so backup recommendations aren't really related to this thread.