I have: (a) a Macbook Pro, (b) a Macbook, and (c) a brand-new 2TB external hard drive.  How many partitions should I make on my external hard drive?

I want to back up both of the laptops, but I'm wondering if it would be a waste of the 2TB to just assign 1TB to each Time Machine backup.  How much space does Time Machine use?  Should I make a third partition for miscellaneous backups (photos from the camera, etc.)?  If so, how big should it be?
Thanks in advice for your input.

Look at this web site devoted to Time Machine:
http://pondini.org/OSX/Home.html
I suspect that this portion will address your situation:
http://pondini.org/TM/15.html
Ciao.

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