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You can create backups of your complete WordPress installation, only the files, or only your WordPress database.
Backups can be restored with 1 click (only backups created by version 1.3 can be restored)!
Both PHP4 (>=4.3.2) and PHP5 are supported now. Backups can be compressed as zip archives (PHP Version >= 5.2 only).
If you need help or want to contribute your translation, feel free to leave a reply at <a href="http://www.beifen.info/" title="Bei Fen" rel="nofollow ugc">Bei Fen</a>.

Bei Fen – WordPress Backup Plugin

You can create backups of your complete Wordpress installation, only the files, or only your Wordpress database.

Takashi Fujisaki

Tiny Backup is a WordPress plugin that allows you to create backup files simply and without any complicated configuration. 
You can create and download the bare minimum backup with just one click, stress-free.
<ul>
<li>Database backup (SQL inside ZIP)</li>
<li>Files backup (select folders under <code>wp-content</code>)</li>
<li>Clear progress indicator and logs</li>
<li>No external services; everything runs on your server</li>
</ul>
This plugin is ideal for small to medium sites that need quick on-demand backups.

Tiny Backup

Simple and minimal backup plugin for WordPress. Create database and files backups with one click.

Bei Fen – WordPress Backup Plugin vs Tiny Backup