[racket] Informations about sqlite database

Hi,
I am trying to learn, through Racket doc, the web server, servlet, etc.. and
i'm locked to the databases.
I understood how to write in the sqlite database, but i don't know how to
save it ( the backup is automatic ? )
In the doc Racket (
http://docs.racket-lang.org/continue/#%28part._.Using_.Formlets%29
(application.rkt)),
it says that it is possible to open a database, (initialize-blog!
(build-path (current-directory) "the-blog-data.sqlite")).

How, from a blog at a given time t, save it as a file, eg
"the-blog-data.sqlite" ?

Thank you for correcting me if I misunderstood ..

Thanks in advance,
-mw
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