Setting up OS X Server has never been easier. Neither has upgrading OS X Server. In this article, we’ll look at upgrading a Mac from OS X 10.8 running Server 2 to OS X 10.9 (Mavericks) running Server 3. The first thing you should do is clone your system. The second thing you should do is make sure you have a good backup. The third thing you should do is make sure you can swap back to the clone should you need to do so and that your data will remain functional on the backup. Once you’re sure that you have a fallback plan, let’s get started by downloading OS…