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6 nines is really really difficult. It’s hard to estimate costs without specific requirements, but a marketplace site with 1000 daily users means you’re expecting about 1 user per minute, which isn’t a lot. I’d imagine you could get by with the cheapest cloud hosting.
The real problem is that most major cloud providers don’t offer 6 nines. Even AWS only offers credits below 99.5%, so you’d want to not lock yourself into a single provider. My best suggestion is to have a small/cheap server with all of the big names and load balance/round robin between them.
This.
At some point, you need to be able to quantify the risk to your business before you can do this.
For instance, if your business earns $10 per transaction, and you perform 100 transactions per second, the difference between five and six nines (313 seconds vs 31 seconds) is $282,000; nowhere near enough to justify the added investment.
Edit: Important to note that for the first example, these are already enormously huge numbers. Such a business, assuming no holidays or weekends, would be grossing $31.5 billion per year, in the same ballpark as Oracle and Coca Cola.
So when we say the company is losing 282,000, this is a tiny, tiny fraction of revenue. Even 99.5%, which is almost two days of downtime, would “only” be a loss of 0.5% of all revenue for the year. Sure, this is $157M, but even that would probably not cover the cost of a six nines infrastructure (that said, they could save up to $120M per year by achieving 99.9%, which would be worth exploring).