VaultPress by Automattic
The Geeks at Automattic are launching VaultPress. A system designed to protect and restore your WordPress environment from ‘aliens’ (more like yourself), possibly faulty plugins, hacks, and other disasters that can destroy seconds if not decades of content in a flash.
“VaultPress is the only restoration service built on the Automattic grid that reliably serves over 10 million WordPress.com blogs and 250 million monthly visitors.”
You can sign up for the beta which is private right now, and by the looks of things it’s looking like a price of about $20 a month for some peace of mind.