WordPress Backup to Dropbox is a nice WordPress Plugin that allow you to backup your entire WordPress blog and upload it to your DropBox account. the plugin is specially designed to give you piece of mind by automatically backup your entire WordPress MySQL database, themes, plug-ins and images folder that you may uploaded to your WordPress folder.
Once you installed and activate the plugin, you need to enter your Dropbox user ID and password to authorize the plugin with your Dropbox account. After that a new window open where Dropbox will ask you to authenticate in order to allow this plugin to access your Dropbox. Once you have granted access to the plugin click continue to setup your backup.
You can also Schedule your backup by choosing a day, time and how often you wish your backup to be performed and after that wait for a zipped archive of your websites files and its database to be dropped in your Dropbox. The plugin uses OAuth (Open Authentication) so your Dropbox account details are not stored for the plugin to gain access to your account.
Download : WordPress Backup to Dropbox