If you get a hosting server of your own, it will work independently, so it will have its own Operating System and you'll be able to later install server side programs directly or script-driven internet sites through 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 a number of reasons. A newer OS version may have better support for specific hardware, so you could get better performance for the websites and web applications you install. Your server shall also be more secure because updates normally include security patches that deal with small issues which may enable unauthorized people to access your content. Last, but not least, current script versions, which are also released for both increased security and for additional features, might require a later version of the Os in order to work correctly and with their 100 % capabilities.