backing up Kmail

Hello group-

I'm a long-time ubuntu user but new to Kmail.  

What's the best way to back up my mail?  A built-in utility would be
nice :-> .  Failing that can you point me to the directory where the
mail messages reside.  I pull email from multiple mail providers but
hope it's not spread all over the directory structure :->

More specifically, this is Kubuntu 11.10, running Kmail 4.8.2

Thanks

RSV869

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