If you get a hosting server of your own, it will work independently, so it'll have its own Os and you can later install server side apps directly or script-driven sites through a hosting Cp. Though keeping the Os updated isn't always considered a necessity, it can be a quite important task for several reasons. A newer OS version could have better support for certain hardware, so you could get better performance for the internet sites and web apps that you install. Your server will also be more safe as updates often include security patches that resolve small problems that may allow unauthorized individuals to access your content. Last, but not least, more recent script versions, which are also released for both improved security and for additional features, might require a later version of the Operating System in order to work effectively and with their 100 % capabilities.