Does updating mac os delete everything
Software Update has conveniently downloaded a 1.09 GB update that I have no interest in installing - it is downloaded but is sitting dormant - but I can't find it to remove it...
OS X Yosemite follows the tradition of providing an easy upgrade install as the default installation method.
Once the download process is complete, you're ready to start the installation process.
As a result, the process really comes down to just following a few onscreen steps and making a choice or two along the way.
Really, it's hard to go wrong with this simple installation method.
As for feature requirements, you may want to check this page to see if a feature that you want works with your Mac.
Auto-Unlock, for example, requires 2013 or new Macs due to Bluetooth limitations so my 2012 Mac mini doesn’t make the cut.
But it's easy enough to divine what the requirements will be since Yosemite doesn't require any new or specialized hardware that could limit it to only certain Mac models.