Amazon S3 Versioning Overview

Amazon S3 versioning is a feature that allows you to keep multiple versions of an object in the same bucket. Here's a summary of the key points covered in the training:

• Bucket-Level Setting: Versioning is enabled at the bucket level.
• File Version Creation: Every time a file is uploaded to a bucket with versioning enabled, a new version of that file is created at the specified key.
• Overwriting Files: If a file with the same key is uploaded again, S3 creates a new version (version two, three, etc.) instead of overwriting the existing file.
• Best Practice: It is considered a best practice to enable versioning on your S3 buckets to protect against unintended deletions or to roll back to previous versions of files.

Advantages of Versioning

• Protection Against Deletion: If a file version is deleted, a delete marker is placed, which allows you to restore previous versions.
• Rollback Capability: You can easily roll back to previous versions of files, such as the version from two days ago.

Important Notes

• Null Version: Files that are not versioned prior to enabling versioning will have a version ID of null.
• Suspending Versioning: Suspending versioning does not delete the previous versions of files; it's a non-destructive operation.

Action Steps

1. Enable versioning on your desired S3 bucket.
2. Upload files to the bucket to create initial versions.
3. Re-upload files with the same key to create additional versions.
4. Use the S3 console to manage and restore previous file versions as needed.

Now, let's head to the AWS console to explore how to use versioning in practice.