[Koha] exporting and importing database?

Hello list :-) I've got a question: We have quite small a library with two branches. There is no internet-connection in any of the sites where the computers are. So, the idea (my idea) is, to export the database of branch A, put the data on CD/Disk, and import that into the database of branch B (and vice versa), maybe once a week or month. Can anyone tell me how that is done? I guess it should work with some MySQL commands? Hope I'm not annoying anyone by asking mysql-questions :-/ So for any ideas, thanks in advance, Stefan Gesing -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/