Will OS Mountain Lion slow down my MacBook Pro (Late 2011) running 10.7.5?

I have a Macbook Pro (Late 2011) that is currently running OS Lion 10.7.5. I was just wondering if updating to OS Mountain Lion would slow it down in terms of performance, or if it will have any other bugs on my MacBook?
PS. When updating to a different OS, do I have to back up my files to like a hard drive or something?

When updating to a different OS, do I have to back up my files to like a hard drive or something?
A back up is a precaution that you should always have, not just when installing an update to the OS. Its purpose is no different from the seat belt you wear when you drive. Use it all the time, and hope it will never be really necessary.

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