I don’t think Dr. Oblivion (wherever he may be) or Jim Groom mentioned  having a plugin to back up your WordPress database. Ideally you’ll want to know how to do it via your cPanel or php mySQL but the wp-db-backup is what would have saved my bacon yesterday had I managed to delete my database rather than just a few WordPress files. I’ve had it installed for over a year, and what it can do is make a weekly or daily backup of your WordPress database – and that’s the part of your site that holds all your posts, comments, and plugin settings. The plugin can zip and save the backup to a folder you set up on your web server or even email you the backup file on whatever schedule you set. If something bad happens you will be able to restore your site’s information from your database backup. No site should be without a regular backup in place.