Use Time Machine only for Mail.app

Time Machine is not my ideal back-up solution, but I do want to use it for Mail. In TM prefs I have Excluded everything except

~/Library/Mail
~/Library/Mail-downloads
/Library/Mail

No luck, all that happens when I click TM is that Mail's menubar disappears.
Can you tell me what necessary files to "not exclude" to make this work?

Thanks,
Haakon.
 
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