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If it is mission critical application that can never be down, you should have at least 2 servers, two internet connection with two ISPs, which is impossible. A load balanced server farm by design would give you better uptime than any single server solution. Nothing can be running all the time. Why not? If it is truly that important, say a life support system. Wouldn't you want it to be 99.9999% uptime or better? 2 redundant servers? Easy. 2 internet connections from 2 ISPs? Expensive but can be done. My previous ISP did that. They were having problems with a ISPs uptime, so they got another connection from a different provider as redundancy.
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