If you get a hosting machine of your own, it will run independently, so it will have its own Operating System and you could later install server side apps directly or script-driven internet sites through a hosting Cp. While keeping the Os updated is not always considered fundamental, it can be a very important task for several reasons. A more modern Operating system version might have better support for specific hardware, so you could get better performance for the websites and web apps which you install. Your server shall also be more safe because updates often include security patches that take care of small problems that may enable unauthorized people to access your content. Last, but not least, more modern script versions, which are also released for both boosted security and for additional features, may require a later version of the Operating System in order to work correctly and with their full capabilities.