If you get a hosting server of your own, it will operate independently, so it'll have its own Os and you can later install server side apps directly or script-driven internet sites via a hosting Control Panel. While keeping the Os updated is not always considered a necessity, it can be a really important task for several reasons. A more modern Operating system version might have better support for certain hardware, so you could get better performance for the sites and web applications you install. Your server will also be more safe as updates usually include security patches which fix small issues that may permit unauthorized individuals to access your content. Last, but not least, more recent script versions, which are also released for both boosted security and for additional features, may need a later version of the Os in order to work effectively and with their 100 % capabilities.