michitzky

On a page within the “Tools” Submenu, you’ll find a simple form which lets you choose the ingredients of a current Backup:
<ul>
<li>Uploads (either by scanning your Upload Directory, or by fetching Attachments from your Database)</li>
<li>Active Theme (and its parent theme, if used)</li>
<li>SQL-Dump containing the Mysql Database</li>
<li>A list of active Plugins</li>
</ul>
Backups will be stored within a folder in wp-content and be downloadable from the Backend. Once the downloads are finished, the backup files on the Server can be flushed.
What’s good:
<ul>
<li>Simple: Choose what is included in your Backup and download the resulting ZIP Archive from your Backend</li>
<li>Unobtrusive: It’s nested within the “Tools” submenu and comes without any bling bling, following default WP Backend Styles</li>
<li>Lightweight: 28KB zipped, 72KB unzipped</li>
</ul>
The plugin author does not take any responsibility for the safety of your data or the integrity of the generated backups.
Credits:
This plugin uses 2createStudio’s shuttle export Script for SQL Export: 
https://github.com/2createStudio/shuttle-export
Banner-Image on Repository: B. Walker, 11.08.2010: http://www.fotocommunity.de/pc/pc/display/22021026
Icons: FamFamFam Silk Icons: http://www.famfamfam.com/lab/icons/silk/

mk Simple Backups

It just does what is says. Quite light and easy to work with.
Thank you.



Nice plugin

Allows you to create simple backups on a dedicated page nested in the "Tools" Menu.

tierrainnovation

Render database profiling at the bottom of all WordPress pages. To install, upload <code>wpdb-profiling</code> to the <code>/wp-content/plugins/</code> directory, activate the plugin, and enable / disable features from the wp-admin plugin screen.

WPDB Profiling

This plugin will give you the total number of queries to the db per page, as well as the total time it took to render those queries out to the page.

mk Simple Backups vs WPDB Profiling