All database content (basically everything that is specific to your site that you have the ability to edit in the CMS) is backed up nightly. The databases are stored on our dedicated servers at Rackspace. We have a hardware firewall at Rackspace that prevents intrusions. The Rackspace team also monitors ports and unauthorized attempts to access the system.
Your files that you upload are stored at Amazon S3. Not only do they back up those files, but we also have a remote backup. From their page at http://aws.amazon.com/s3/faqs/:
Q: How durable is Amazon S3?
Amazon S3 is designed to provide 99.999999999% durability of objects over a given year. This durability level corresponds to an average annual expected loss of 0.000000001% of objects. For example, if you store 10,000 objects with Amazon S3, you can on average expect to incur a loss of a single object once every 10,000,000 years. In addition, Amazon S3 is designed to sustain the concurrent loss of data in two facilities.
Q: How is Amazon S3 designed to achieve 99.999999999% durability?
Amazon S3 redundantly stores your objects on multiple devices across multiple facilities in an Amazon S3Region. The service is designed to sustain concurrent device failures by quickly detecting and repairing any lost redundancy. When processing a request to store data, the service will redundantly store your object across multiple facilities before returning SUCCESS. Amazon S3 also regularly verifies the integrity of your data using checksums.
The CMS login page that you use is encrypted with SSL. This means that the session between your computer and our CMS is secure.