Plugin to get a database backup from a WordPress installation

I usually want to extract a database backup from my live WordPress installations. Sometimes I am lucky and can ssh into the machine and use mysqldump directly and sometimes I need to use PHPMyAdmin.

But, every now and again I loose my login details to all those different hosting companies and it would be nice to get a database dump directly from the WordPress installation itself.

One plugin that solves this for me, is WP Migrate DB, so if I just can remember how to login to the WordPress installation, then it will be quite easy to get the wanted database dump.