If you get a server of your own, it will work independently, so it'll have its own Os and you could later install server side applications directly or script-driven websites via a hosting Cp. Though keeping the Operating System updated isn't always considered fundamental, it can be a quite important task for a variety of reasons. A more modern Operating system version may have better support for certain hardware, so you may get better performance for the internet sites and web apps you install. Your server will also be more safe because updates normally include security patches that deal with small problems that may enable unauthorized people to access your content. Last, but not least, more recent script versions, which are also released for both enhanced security and for additional features, might require a later version of the Os in order to work properly and with their 100 % capabilities.