If you get a hosting machine of your own, it will run independently, so it will have its own Os and you can later install server side applications directly or script-driven internet sites through a hosting Cp. Even though keeping the Os updated isn't always considered an absolute necessity, it can be a rather important task for a number of reasons. A newer OS version may have better support for specific hardware, so you might get better performance for the internet sites and web applications that you install. Your server shall also be more secure because updates normally include security patches which deal with small issues which may allow unauthorized individuals to access your content. Last, but not least, newer script versions, which are also released for both increased security and for additional features, may require a later version of the Operating System in order to work correctly and with their full capabilities.