Core concept
Savings Plans: commit $/hour of compute for 1 or 3 years. Applies to EC2, Fargate, Lambda. Payment: no/partial/all upfront.
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How it works
Standard RI: locked to family/region. Convertible: exchange for other RI. SP is more flexible + increasingly preferred.
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Trade-offs + gotchas
Predictable steady-state workloads. Base capacity (below spot). Long-running production. Not for spiky/experimental.