Cloud pricing is often presented as a simple “pay for what you use” proposition, perhaps with volume discounts — or penalties. But pricing can be as complex as for any on-premises licenses or network bandwidth service. Exhibit A: reservation-based pricing, such as Amazon Web Services’ Reserved Instances.
If you expect consistent, heavy use, Reserved Instances can provide substantial savings over owning your hardware, as well as over using AWS’s standard as-needed pricing.
But with Reserved Instances or its equivalents at other cloud providers, such as Microsoft’s Enterprise Agreement for Azure, you’re betting you’ll actually use the instances you reserve because you’ll pay for them whether or not you use them. If you forecast less consumption than you end up needing, you’ll pay full retail prices for the excess — an amount likely not covered in your budget forecast.
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