I have recently released a new script to help Cloud Sites customers easily setup scheduled backups.
The script includes a simple web installer to help setup all the necessary API files and configure the backup script for the domain/database.
Hopefully this will be useful to those looking to backup their Cloud Sites to Cloud Files.
I am excited to say that Cloud Sites has partnered with Codeguard to provide a full featured backup solution.
Read more here: http://www.rackspace.com/blog/simply-backup-cloud-sites-with-codeguard/