If you get a hosting server of your own, it will run independently, so it will have its own Os and you could later install server side apps directly or script-driven internet sites through a hosting Cp. Though keeping the Os updated is not always considered a necessity, it can be a very important task for a variety of reasons. A more modern OS version may have better support for certain hardware, so you may get better performance for the internet sites and web applications which you install. Your server will also be more safe since updates typically include security patches which resolve small problems which may permit unauthorized individuals to access your content. Last, but not least, more modern script versions, which are also released for both improved security and for additional features, may require a later version of the Operating System in order to work properly and with their 100 % capabilities.