WordPress – back up your own blog platform.
To see WordPress in action on this website, click here.
To ensure that you don’t lose all your WordPress site before doing an upgrade, I recommend installing a plug-in called the WordPress Database Backup. You can get it from http://www.ilfilosofo.com/blog/wp-db-backup
Otherwise, download it directly from the above website (one less click anyway!). Save this file somewhere, then unzip it to your /wp-content/plugins folder.
Login to your WordPress installation, go to the PlugIns link over to the right hand side (if you’re using a version of WordPress less than 2.7) and activate it!