A company stores logs in an Amazon S3 bucket. When a data engineer attempts to access several log files, the data engineer discovers that some files have been unintentionally deleted. The data…

Manually backing up the S3 bucket is a high-operational-overhead task, prone to human error, and less effective than automated versioning for preventing unintentional deletions and facilitating recovery.

Enabling S3 Versioning for the S3 bucket is the most direct and effective solution for preventing unintentional file deletion. When versioning is enabled, every deletion action creates a new delete marker instead of permanently removing the object, allowing for easy restoration of previous versions of the file with minimal operational overhead.

Configuring replication (e.g., S3 Cross-Region Replication or Same-Region Replication) creates copies of objects in another bucket. While it provides disaster recovery and redundancy, it does not prevent unintentional deletions from the source bucket; a deletion in the source bucket would typically be replicated to the destination (unless specific replication rules exclude delete markers), potentially propagating the unintentional deletion.

Using an Amazon S3 Glacier storage class is for cost-effective long-term archiving of infrequently accessed data. While it secures data in archival tiers, it's not primarily designed to prevent unintentional deletions from an active S3 bucket; instead, it manages data lifecycle and access patterns, and retrieving data from Glacier classes involves restoration delays and costs.