Before you upgrade your macintosh operating system, it is strongly recommended that you backup your computer hard drive to an external hard drive using Time Machine and Carbon Copy Cloner or SuperDuper.  See the video links below:  How to Format an External Drive, Create a Bootable Backup Drive, Format a Hard Drive, SuperDuper Backup, and How To Use Time Machine for the Mac. 

 Youtube Tutorials

(Click on Windows Below)

   SunMacs Computer Club

YouTube Videos have links below that you can click on to view how-to movies.

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