Case Study: To Reserve or Not Reserve?

Scenario

You've recently been contracted by a small legal firm, ABC, to help lower their AWS bill on an AWS landscape that was set up by an external consultant. The first thing you notice is that all their EC2 instances are running On Demand. When you inquire as to why they haven't used any optimized pricing plans, they say this was just how the original consultant set everything up.

A quick call to the consultant, who still remotely supports the law firm's apps, revealed that they don't know much about AWS and were unaware of other potentially less costly pricing options. They said we are welcome to change ...