backing up folders

[TerryinNC]

Is it possible to store the message folders "on the SD card" or somewhere I can access them with a backup program?  Both of my mail accounts are POP only and I would like to keep all my actions on my PC.  I'm using automatic BCC, but I've been in this situation before and know managing that becomes a mess, particularly in conversations. 
I've been a Thunderbird user for 10+ years and I am impressed (surprised) to find such a sophisticated app on a tablet.  Thanks

[TerryinNC]

Just discovered Hotmail is saving my outgoing messages in my sent folder on the server even though its not an Imap connection!  So that solves half my tracking/syncing problem.  Thanks, Hotmail.  Now I just need to get to my ISP'a sent folder on the tablet so I can back it up or sync it with my windows box.