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by o-__-o 1945 days ago
I would argue there are some services that need 5 nines (or more) of availability.

Your support ticketing system and company web presence are two I can think of. I provide the ticketing service myself but I outsource my web presence (the landing page not the app) to a third party service. My thought is the web site should never go down. If the ticketing system is down it means things are beyond hosed :)