You need to incorporate a db backup tool, in your otherwise awesome software program. My idiotic hosting company doesn't have a dump utility in their database tool, that's why I'm going to a different company and I need to backup the db as fast as possible.
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There are various great scripts that permit backup of mysql DB : phpmyadmin, backupdb, phpmydump ... See [url=http://php.resourceindex.com/Complete_Scripts/Database_Manipulation/SQL_Databases/]php ressource index[/url] for find these scripts.
Perhaps one day one little script will be included in b2evo bu this is not priority at all I think ;)