How much HD space do i need to backup computer?

I am new to mac's and just wondering how much room i will need approx. to backup my computer?
thanks

OK, our posts are crossing - my fault.
To check size of your internal HD, complete system, click on the Macintosh HD in the left of Finder and on the bottom of the finder window you will see how much has been used.
It looks like you internal HD has used 30GB so 300GB is good. You could partition this to say 200GB for TM and the rest for other data.
Joe

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