Last time I updated my iOS (in El Capitan) it completely wipe my computer. Which will happen again if I switch to the Sierra?

When I updated my computer last time, it wipe completely all of my files. Which happen if I update to Sierra?

It didn't wipe my Macbook Air, the upgrade of El Capitan in Sierra. Also, just a note, iOS is the mobile operating system for iPhone and iPad, OS X is for Mac.

Tags: Mac OS & System Software

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