gigorok

This plugin allow to backup files and database and sends them to your email. 
You can setup a periodically backup.

Backup2Email

This plugin allow to backup files and database and sends them to your email

Andrew Forster

nickyoung

<ul>
<li>Choice of Backup Method – FTP/Email/both.</li>
<li>Choice of Backup Type – Database Backup/File System Backup/Full Backup</li>
<li>Backup Selection List – Specify specific files and folders to backup – NEW FEATURE !!</li>
<li>WP Admin Instant backup – perform a backup from WordPress Admin interface.</li>
<li>URL Instant Backup – perform a backup by visiting a public URL (containing secret hash key).</li>
<li>Password Protected ZIP files – in-case the backup falls in the wrong hands.</li>
<li>Custom backup file names – specify the prefix of output ZIP file.</li>
<li>Improved Interface with Green and Red notifications to make sure your settings are right.</li>
</ul>
<h3>License</h3>
Copyright 2011 by Andrew Forster & Nick Young
This program is free software; you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published by 
the Free Software Foundation; either version 2 of the License, or 
(at your option) any later version.
This program is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
GNU General Public License for more details.
You should have received a copy of the GNU General Public License 
along with this program; if not, you can download a copy from http://www.gnu.org/licenses/licenses.html

WP-InstantBackup

WP-InstantBackup makes it simple to perform database and/or directory backups via FTP, Email, or both.

Backup2Email vs WP-InstantBackup