Looks like 37signals changed a bit in 6 years :
http://37signals.com/svn/archives2/dont_scale_99999_uptime_i...
Also, that's why we're comparing uptime against big, established web applications. I would not hold these standards up to a 1 year-old, newly started business. You have far more important things to worry about than getting an extra 9 on your uptime.