We are performing this on the latest Mac OS X Yosemite version, however the process is pretty much the same across other version of Mac OS X.

Ensure you have a usb, firewire or thunderbolt external harddrive connected to your computer, and available for backup.

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More by edaguero:How to Install VMware vSphere client onto a Windows Domain Controller How to repair your Mac hard drive, and disk permissions using Disk utility on Mac OS X Yosemite How to show file extensions on Mac OSX 10.10 Yosemite 
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