If you get a hosting server of your own, it will work independently, so it'll have its own Os and you can later install server side apps directly or script-driven internet sites through a hosting Control Panel. Even though keeping the Operating System updated isn't always considered an absolute necessity, it can be a quite important task for several reasons. A more modern OS version could have better support for certain hardware, so you might get better performance for the sites and web applications which you install. Your server will also be more safe since updates often include security patches that resolve small issues which 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 correctly and with their 100 % capabilities.