Sage advice in thinking about the Amazon EC2 / S3 disaster planning
Artur Bergman (who has recently joined O’Reilly radar and gave a kick-ass talk about his experiences in scaling live journal at foo camp.) offers some sage advice for those people that are comptemplating using EC2 and S3.
Artur seriously knows his stuff, and he lists some points that you should consider when using EC2 or S3, but the principles hold for any other webservice. To cut a long story short, read the small print of your service agreements and figure out your worse case scenario and how you can mitigate those risks.