I stumbled across this article on Mashable: the server host company that SixApart apparently uses, 365Main, had issued a press release today celebrating its continuous uptime record. But the best part? This quote:
…The company’s San Francisco facility includes two complete back-up systems for electrical power to protect against a power loss. In the unlikely event of a cut to a primary power feed, the state-of-the-art electrical system instantly switches to live back-up generators, avoiding costly downtime for tenants and keeping the data center continuously running.
The Mashable article is here.