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Cloud Computing · Foundational

S3 Versioning

Bucket setting that keeps multiple versions of each object to protect against accidental overwrites and deletions.

Definition

With versioning enabled, every PUT creates a new version and a DELETE inserts a delete marker instead of removing data, so prior versions can be restored. Once enabled, versioning can only be suspended, not disabled. It is required for replication and Object Lock, and MFA Delete can further protect versions.

Example

A user deletes report.xlsx, and an admin restores it by removing the delete marker.

Exam tip

Versioning increases storage cost; pair it with lifecycle rules to expire old versions.

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