If you get a server of your own, it will work independently, so it will have its own Operating System and you could later install server side applications directly or script-driven sites via a hosting Control Panel. Even though keeping the Operating System updated isn't always considered a necessity, it can be a really important task for several reasons. A newer OS version might have better support for certain hardware, so you might get better performance for the internet sites and web applications which you install. Your server will also be more safe because updates often include security patches that resolve small problems which may allow unauthorized people to access your content. Last, but not least, current 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.