Is downloading OS X Mavericks a good idea for my mac book pro?

I have heard alot of controversial information about downloading OS X Mavericks. Ideally I would like to download it but I am afraid of losing everything on my macbook. Should I download it anyways? or not? or back up my mac and then download? if so, how would I go about backing it up?

That's a very logical question, and yes... that's exactly what you want to do.
Get an external USB hard drive. They're cheap on Amazon, or you can often catch a good sale somewhere else. I'd start by formatting it with Disk Utility as 1 partition, GUID, and Mac OS X Extended (Journaled) NOT case sensitive. If you don't know how on that part, just write back and someone will walk you through it.
The other thing you want is Carbon Copy Cloner. It's not free, but unlike its competition it will also copy the recovery partition. Use CCC to make an exact copy of your existing drive before you install Mavericks. That way if you have any problems it's very easy to go back.
By the way, good thinking. A lot of people don't consider this and it's pretty hard to go back without doing this procedure.

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