I have recently bought an 8Gb macbook pro. If I update it to mountain lion will it take half of the memory I have?

I have recently bought an 8Gb macbook pro. If I update it to mountain lion will it take half of the memory I have?

Well thats upto you but before any major update a backup is recommended, you should also be backing up your system as a matter of good housekeeping.
Time machine makes this very easy, you will require an external disk at least twice the size * of your hard drive in you Mac. Connect it to you Mac with USB, Firewire or Thunderbolt, whatever you wish. You can use Time Machine to take a backup of the hard drive.
If you are unfortunate and have a hard drive fail you can recover all your data very easily.
Apple also sell a product called Time Capsule http://www.apple.com/timecapsule/ but I just use an External Disk.
*** Twice the size may be a bit excessive, it depends on how full your hard drive is and how much you expect it to fill.***

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