Note: This is for self-hosted Worpdress sites, not for WordPress.com sites.
If you have a self-hosted WordPress site running on Dreamhost and you want to make scheduled backups without having to do anything more once you have set up the system, you can now back up to Dreamhost’s Dreamobjects Amazon S3 buckets using this WP plugin.
DreamObjects Plugin » Connect your WordPress site to DreamHost’s DreamObjects