How much space no I need to make Carbon Copy Clone of my internal drive?

I am upgrading the RAM and HDD in my mid 2009 Macbook Pro. How much space on my external hard drive do I need if I want to make Carbon Copy Clone of my internal drive?
Current drive is 250 GB in capacity
I currently have limited space on in external HD

Hi Niel thanks for the quick reply,
My 250GB capacity drive is relatively full (at about 245GB). Given what you mentioned above,  I assume  I must need to have room for 20GB of surplus space for each backup I make?
And therefore, would I need 265GB (to backup the 245GB drive) for the first time I clone the drive?
Have I got that right?
Cheers

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