I have a 2010 MBP that I am looking into updating. Spec - 2010 MBP 10.6.8 2.66 C2D 4GB Ram 320 GB HD I have a version of mavericks downloaded from a while ago but never installed as I wasnt sure on the process. My questions are is it worth updating? And if so, to Mavericks or Yosemite? If I were to update, what steps should I take before I do so other than a back up. Can I do a fresh install or just update via the app store?