Making accurate calculations of data center cost is of course complicated and rarely manages to take everything into account, but the common knowledge I’ve heard is that there comes a point when a company is so large that going on-prem is what actually saves them a lot of money. If FedEx is not large enough to be one of those companies, how large do you actually have to be? Or has cloud pricing changed to the point w…
Take FedEx, their operations are highly dynamic - per day but also per period. The number of packages sent, and being transported, vary greatly between a random Tuesday 15:00 and the weeks before holidays.
In such a scenario, with your own infrastructure, you need to overprovision, by a lot, to be able to handle the heaviest load possible, and then some margin on top. And that capacity is wasted what, 90% of the year?
Meanwhile if you subcontract that part on AWS, it's their problem, and they can afford to handle it, and you only pay for what you actually use when you use it.