


This is NOT the same as using Time Machine and restoring. Therefore you must backup your data manually beforehand, using a method of your choice. Wiping over and starting over clean is the entire point of this. Important note: a clean install will erase everything on the Mac and then install macOS Sierra, nothing else will be on the Mac. A manual backup of your personal files, data, photos, and important information.A Mac compatible with macOS Sierra ( see list of Sierra compatible Macs here).If you understand the objective and are comfortable with the clean installation process, you will need the following:

The vast majority of Mac users will be better served updating to macOS Sierra using the standard install and update method via the Mac App Store. Because the clean installation process involves manually backing up important files and data from a Mac (not just using Time Machine), formatting the hard drive and erasing everything in the process, using a boot installer disk to perform a clean installation of Sierra, and then manual file transfers to restore personal data, this is best reserved for advanced users.
