If you get a hosting server of your own, it will operate independently, so it will have its own Os and you can later install server side applications directly or script-driven websites via a hosting Cp. While keeping the Operating System updated is not always considered a necessity, it can be a really important task for a variety of reasons. A newer Operating system version could have better support for certain hardware, so you might get better performance for the websites and web applications which you install. Your server will also be more secure because updates normally include security patches which deal with small issues which may permit unauthorized people to access your content. Last, but not least, more recent script versions, which are also released for both boosted security and for additional features, might require a later version of the Operating System in order to work correctly and with their 100 % capabilities.