If you get a hosting machine of your own, it will run independently, so it will have its own Os and you could later install server side applications directly or script-driven websites via a hosting Cp. While keeping the Operating System updated isn't always considered a necessity, it can be a quite important task for several reasons. A more modern OS version might have better support for specific hardware, so you might get better performance for the sites and web apps you install. Your server shall also be more protected as updates normally include security patches that fix small problems that may permit unauthorized people to access your content. Last, but not least, newer script versions, which are also released for both improved security and for additional features, may need a later version of the Os in order to work correctly and with their full capabilities.