I am finally going to upgrade my Mac Pro to Mavericks. It is currently running SL 10.6.8. I will definitely perform a clean install and then reinstall all applications manually. But I can't decide if I should use the Setup Assistant to move my data over or if I should do it all manually. Reason for a completely manual migration: A clean start. My system currently contains over a decade's worth of clutter. My user library folder is several hundred GB in size and I have no idea what most of the stuff in there is. It's a mess and it doesn't feel right. Reason for using Setup Assistant: It basically guarantees that nothing important is forgotten and - more importantly - it automatically takes care of stuff that can be very troublesome to transfer manually, like Mail data for example. The Setup Assistant seems safer in this regard than a completely manual migration. What do you think?