JJR512, I understand that the code wluke posted does that.
Like he said, it's not fancy or anythin, but works.
Cyrus, no, not really.
This is more like (a very very lite version of) phpMyAdmin, not Telnet.
Although most of the commands you can use in Telnet you can use here (SELECT, UPDATE, INSERT, DELETE, ALTER queries, stuff like that), I'm not sure how you can do a backup from here.
And don't forget there is a backup utility in vBulletin.