If you get a hosting server of your own, it will work independently, so it'll have its own Operating System and you could later install server side apps directly or script-driven sites through a hosting Cp. Though keeping the Operating System updated isn't always considered a necessity, it can be a very important task for a variety of reasons. A more modern OS version might have better support for certain hardware, so you might get better performance for the internet sites and web apps that you install. Your server will also be more safe since updates typically include security patches which fix small issues that may enable unauthorized individuals to access your content. Last, but not least, newer script versions, which are also released for both boosted security and for additional features, may need a later version of the Os in order to work properly and with their full capabilities.