:facepalm:
We really need a facepalm smiley here on vB.org, ya know?
PHP Code:
$config['SpecialUsers']['canviewadminlog'] = '';
$config['SpecialUsers']['canpruneadminlog'] = '';
$config['SpecialUsers']['canrunqueries'] = '';
$config['SpecialUsers']['undeletableusers'] = '';
$config['SpecialUsers']['superadministrators'] = '';
These are the directives in the Config file that deal with Special Users, including Admins. Obviously, you would not put them in there is you are worried about them even backing up the database. XD
My advice to you is that if you are worried about another Administrator backing up your database and running off with your forum, then you should not be making that person an Administrator in the first place.

However, if you are worried about him directly altering your database, don't fret--only users set in the 'canrunqueries' can run queries directly. :3