How do I downgrade a computer to a previous operating system?

I recently upgraded to Yosemite but I didn't like it. Can I downgrade? If so how?

Hello Hamstersrule,
In order to revert to a previous version of the OS, you would need to have a backup in Time Machine of your system before you upgraded. This article will help you do that:
OS X Yosemite: Revert to a previous OS X version
Thank you for using Apple Support Communities.
Take care,
Sterling

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