Which S3 feature set is essential to protect against accidental deletions and ensure long-term durability in a data lake?

• A. Enable versioning, MFA delete, cross-region replication, and lifecycle policies.
• B. Use bucket encryption only.
• C. Disable versioning to save space.
• D. Enable S3 Transfer Acceleration only.

Answer: (A)

Protecting a data lake in S3 against accidental deletions and ensuring long-term durability relies on a multi-layer approach that combines versioning, strong deletion controls, geographic redundancy, and automated lifecycle management. Turning on versioning keeps every object version, so if a file is deleted or overwritten, the previous versions remain accessible and can be restored. MFA delete adds an extra authentication step for permanently deleting object versions or changing versioning state, shielding against human error or malicious actions. Cross-region replication duplicates objects in another AWS region, providing geographic resilience so a regional outage won’t erase data. Lifecycle policies automate retention and archival, moving data to cheaper storage over time or expiring old versions according to rules, supporting durability and cost efficiency.

Encryption alone protects confidentiality, not recoverability from deletions. Disabling versioning removes the ability to recover prior versions. And Transfer Acceleration affects transfer performance rather than data protection or long-term durability.