If you get a hosting machine of your own, it will run independently, so it'll have its own Operating System and you can later install server side apps directly or script-driven internet sites via a hosting Cp. Although keeping the Os updated is not always considered an absolute necessity, it can be a quite important task for a number of reasons. A newer OS version might have better support for certain hardware, so you might get better performance for the internet sites and web apps which you install. Your server shall also be more secure since updates often include security patches which deal with small issues which may enable unauthorized individuals to access your content. Last, but not least, more recent script versions, which are also released for both increased security and for additional features, might require a later version of the Operating System in order to work properly and with their full capabilities.