How to do a complete backup of SL before trying out Lion

I was thinking to install the new Lion OS on my MBPro 17" (2010 model) but I read too many bad reviews about it so I want to completely back up my current system before I do so. Since I've never done that before can someone suggest if the following is available:
A. Make a complete backup of the whole computer (I mean, OS X Snow Leopard + all my data files. Again it's a stock MBP 17" with a 500GB HDD, where 288GB are available.)
B. Be able to restore the whole system from the backup like if nothing happened.
Am I asking for too much?

A.  The best way is to clone your current system to an external drive using Carbon Copy Cloner or SuperDuper.
CCC can be found here:
http://www.bombich.com/
B.  You can either install Lion on the external drive and test it there, or you can install on your internal drive and Clone your external copy back to the internal drive if you don't like it.
Regards,
Captfred

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