It's always interesting watching startups learn the lessons that thousands of enterprise learned along the way. "Why would you ever want offline tapes sitting in iron mountain, how inefficient".

Nothing is foolproof, but anytime you've got constant network access to every last copy of your data, you're begging to lose it. It's the reason why people who think one copy (redundantly dispersed or not) in AWS S3 is sufficient scares me to death. Is it unlikely Amazon would get hacked and have the entire thing blown up? Sure... but if we go to war with China I wouldn't want to bet my company on it.