Performing database backup is easy; it's just a matter of exporting all your data into a single SQL file. And if you're using WordPress, the task is even a lot easier.
Automatically Backup Your WordPress Blog To DropBox
WordPress Backup to Dropbox (link) is a wonderful creation of Michael Dewildt that gives you the peace of mind you deserve. Just choose a day, time and how often you wish your backup to be performed and sit back and wait for your websites files and a SQL dump of its database to be dropped in your Dropbox!
Follow this 4 easy steps on how to backup your WordPress blog to DropBox.
Step 1 Download and install WordPress Backup to DropBox. Activate it.
Step 2 Authorize the plugin to connect to your Dropbox account.
Step 3 A new window should open where Dropbox will ask you to authenticate in order to allow the plugin access to your Dropbox.
Step 4 Once you have granted access to the plugin click continue to setup your backup.