1Ransomware and Accidental Deletion Protection
Without versioning, a compromised script or human error could wipe out an entire S3 bucket instantly. With versioning enabled, even if an attacker deletes all objects, they only create Delete Markers. The original data can be easily restored by removing the Delete Markers. To protect against attackers deleting specific versions, S3 MFA Delete or S3 Object Lock (WORM model) can be used to ensure absolute immutability.
2The Cost Trap of Versioning
A major pitfall of enabling versioning is exponential cost growth. If an application overwrites a 1GB log file 10 times a day, S3 stores 10GB of data per day. Without a Lifecycle policy to transition or expire noncurrent versions, your S3 bill will keep growing indefinitely. Best practice dictates that every versioned bucket must have an accompanying lifecycle expiration rule for noncurrent versions.
