Amazon EC2 cost optimization KIS FRI UNIZA  On-Demand Instances  Pay by the hour  No long-term commitments.  Eligible for the AWS Free Tier.  Reserved Instances  Full, partial, or no upfront payment for instance you reserve.  Discount on hourly charge for that instance.  1-year or 3-year term.  Scheduled Reserved Instances  Purchase a capacity reservation that is always available on a recurring schedule you specify.  1-year term. EC2 pricing models 22 110