sahaskatta

When enabled, the admin email address gets a message including the title, author, time stamp, category, tags, and content of each post as it gets published. Edits to published posts are also emailed.
Why use this?
<ul>
<li>Keeps the admins aware of all new content</li>
<li>Notifications when published posts are modified</li>
<li>Enable with just one-click, no hassle</li>
<li>No bloat, uses a simple PHP Mail command</li>
<li>An extra layer of backup if backups are lost</li>
</ul>
Notice: This isn’t by any means an alternative or replacement for regular database and file backups.

ST Email Backup For Published Posts

This plugin emails the admin email account a copy of each post as it gets published.

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

ST Email Backup For Published Posts vs Backup2Email