Another vote for time machine. Also under OSX 10.8 Mountain Lion you can specify two separate disks to backup to simultaneously.
As for copying just you mail folders to a USB stick the easiest way is to select Mailbox > Export Mailbox... from the menu and it will export it where you tell it.
You can also go find the files and copy them but that's a little harder to describe if you are using Mountain Lion.
MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
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