How are companies like amazon able to allocate so much hardware for cloud storage?

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I’ve been working with amazon aws and I’m confused how amazon can possibly have enough hardware to handle all it’s customers and users. I was reading one of the benefits of cloud storage is that there’s no hardware maintenance for the user and no need to upgrade every X amount of years. Wouldn’t amazon run into the same issue? Wouldn’t they need to update their hardware every X years and wouldn’t it cost millions of dollars?

In: Technology