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4. S3 Storage Classes and Lifecycle Policies

Durable object storage with cost-aware retention rules.

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Amazon S3 stores objects inside buckets and addresses them by keys. It provides high durability, versioning, encryption, access policies, and event notifications. Storage classes trade retrieval speed and cost: Standard fits active data, Intelligent-Tiering adapts to changing access, and Glacier classes fit archival data.

Lifecycle rules can transition objects to colder classes or expire old versions automatically. Treat bucket policies, public access blocks, and encryption defaults as part of the design rather than afterthoughts.

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  1. 1. What does an S3 lifecycle rule commonly do?

  2. 2. Which S3 feature helps recover an accidentally overwritten object?

  3. 3. What should be enabled for a sensitive bucket by default?

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