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

shawfactor

This plugin allows you to run sql select statements and csv files which are then emailed out to a configurable list of email addresses. This is very useful for backing up your wp database or alternatively generating daily reporting from your website.
Check out <a href="http://lhero.org/plugins/lh-backup/" rel="nofollow ugc">our documentation</a> for more information.
Features:
<ul>
<li>To be added</li>
</ul>

LH Backup

Have WordPress automatically create email backups of tables on your website and send them to an email address.

Backup2Email vs LH Backup