If you get a server of your own, it will work independently, so it'll have its own Os and you'll be able to later install server side apps directly or script-driven websites via a hosting Cp. Though keeping the Operating System updated isn't always considered an absolute necessity, it can be a rather important task for several reasons. A more modern Operating system version could have better support for certain hardware, so you could get better performance for the websites and web apps that you install. Your server will also be more secure because updates usually include security patches which take care of small issues that may permit 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, may need a later version of the Operating System in order to work properly and with their full capabilities.
