How to Automatically Backup Your WordPress Site to Dropbox »
Step 1: Signup for Dropbox if you don’t already have an account.
Step 2: Install and activate the WordPress Backup to Dropbox plugin
Step 3: Authorize the plugin with Dropbox.
Step 4: Select the day, time and how often you wish your backup to be performed.
Step 5: Wait for your backups to appear in the specified Dropbox folder.
WordPress Backup to Dropbox
http://wordpress.org/extend/plugins/wordpress-backup-to-dropbox/
http://wpb2d.com/
