We have a 75 light year radius sphere of expanding radio signals. If anyone is out there listening, we are the kid knocking over bookshelves in the library of the universe.
IIS has an 18% market share and something like 90% of successful breakins to web servers are done against IIS servers. Roughly 80% of the webserver market is running linux.
When's the last time you saw google get hacked? They run a custom OS built on top of linux. Facebook runs linux on their servers. All of the top supercomputers in the world run linux, 80% of the top 500 run linux. I don't remember the last time anyone ever said a supercomputer was hacked, do you?
If you want to point out these rootkits and exploits, feel free to show me them. I would be amazed that any major exploit for a linux OS would not have been patched quickly.
The only real way of breaking into a linux system that I know of is to have physical access to the computer or to have a bad sysadmin.
You will have many recoverable tape errors.