If you get a hosting machine of your own, it will work independently, so it'll have its own Os and you can later install server side programs directly or script-driven websites through a hosting Cp. While keeping the Os updated isn't always considered an absolute necessity, it can be a rather important task for a number of reasons. A more modern OS version might have better support for specific hardware, so you could get better performance for the internet sites and web applications which you install. Your server shall also be more safe since updates often include security patches that fix small problems which may allow unauthorized people to access your content. Last, but not least, more modern script versions, which are also released for both improved security and for additional features, may require a later version of the Operating System in order to work properly and with their 100 % capabilities.