Complete a backup to Time Machine before beginning. If you don’t know what you’re doing with making manual file backups or with a clean install of macOS Sierra, don’t proceed, you will lose all data on the Mac. 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.
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