So it is 6 hours complete outage in around 22 months since its opening beta. The lifetime outage is somewhat around 6/(30 * 22 * 24) = 0.00037 = 0.037%! I think this is pretty impressive achievement to build a system with uptime as 99.963%. Especially for some poor engineers woke up at 2am in Seattle and started to figure out what went wrong and get it back on line. I think it is pretty cool.<p>In the case when our PCs/Macs crashed. Even I could rush to a Circuit city/JR store to get a replacement hard drive. I probably will spend the same amount of time just to revive my system, given I have good habit back up the system. If that is not the case, I will need to reinstall operating system and applications. I guess the down time may be 24 to 48 hours.<p>So the downtime for a person without good habit in backup. The uptime will be 99.849%! if it takes 24 hours to get back the system in 22 months.