If you get a hosting server of your own, it will run independently, so it'll have its own Operating System and you can later install server side applications directly or script-driven internet sites through a hosting Control Panel. Even though keeping the Operating System updated isn't always considered fundamental, it can be a quite important task for several reasons. A newer OS version might have better support for specific hardware, so you could get better performance for the sites and web apps that you install. Your server shall also be more secure as updates often include security patches that take care of small problems that may enable unauthorized individuals to access your content. Last, but not least, more modern script versions, which are also released for both boosted security and for additional features, might require a later version of the Os in order to work properly and with their full capabilities.