What is versioning in S3?

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Accepted Answer

S3 Versioning is a way to keep multiple variants of an object in the same bucket. By default, versioning is disabled on all new buckets, but you can enable it at any time . Once enabled, S3 automatically assigns a unique version ID to each object uploaded. If you later upload a new version of the same object, the previous version is retained instead of being overwritten. This provides a powerful safety net against unintended user actions and application failures . When versioning is enabled, overwriting an object creates a new version with its own version ID, while the original version remains accessible . If you delete an object, S3 does not permanently remove it. Instead, it adds a 'delete marker' on top of the stack. This marker becomes the current version, making the object appear deleted in standard listings, but all previous versions are still recoverable . To permanently delete an object, you must delete each version individually or remove the delete marker to restore the previous version . Objects stored before versioning was enabled receive a version ID of `null` . # Enable versioning on a bucket
aws s3api put-bucket-versioning --bucket=your-bucket-name --versioning-configuration Status=Enabled

# Check versioning status
aws s3api get-bucket-versioning --bucket=your-bucket-name

# Expected output when enabled:
# {
#     "Status": "Enabled"
# }

# List all versions of all objects
aws s3api list-object-versions --bucket=your-bucket-name

# Output shows array of Versions with their VersionId, IsLatest flag, and other metadata

# Download a specific version
aws s3api get-object --bucket your-bucket-name --key your-file.txt --version-id VERSION_ID local-file.txt

# The VersionId from list-object-versions is used here A bucket can be in one of three states: unversioned (default), versioning-enabled, or versioning-suspended. Once versioning is enabled, the bucket can never return to an unversioned state—it can only be suspended, which stops new versions from being created but retains existing versions . Each version is a complete object, not just a diff of changes, so you are charged for every version stored. For example, three versions of a 1GB object will be billed as 3GB of storage . To control costs, it's recommended to combine versioning with S3 Lifecycle rules to automatically transition older versions to lower-cost storage tiers or expire them when no longer needed .

What is versioning in S3?

Amazon S3 Versioning is a feature that helps protect your data by preserving multiple versions of an object in the same bucket, allowing you to recover from accidental deletion or overwrites .

What is versioning in S3?

Amazon S3 Versioning is a feature that helps protect your data by preserving multiple versions of an object in the same bucket, allowing you to recover from accidental deletion or overwrites .

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