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AWS Certified DevOps Engineer - Professional Certification and Beyond
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In the S3 service, you can keep track of how files change over time using the versioning feature. While this feature does add additional cost, it is especially useful as a way to help restore deleted objects.
Once you enable versioning, each object in that S3 bucket gets a value for the version ID. If you haven't enabled versioning on the bucket, then the version id for the objects in the bucket is set to null:
Figure 4.19 – An S3 bucket with versioning enabled showing version ids
Once you upload a subsequent version of the object with versioning turned on, Amazon produces a new version id for the new version of the object and then places that newer version of the object in the bucket.