Cloud Storage Lifecycle Retention Bucket Lock

What the Solution Is

This configuration pairs Cloud Storage Bucket Lock with Object Lifecycle Management (OLM) to enforce regulatory compliance (WORM - Write Once, Read Many) while automating storage class transitions and end-of-life object deletion.

How It Meets All Requirements

• Immutable retention for 7 years: Creating a bucket retention policy with a duration of 2,555 days and applying Bucket Lock permanently prevents the retention period from being reduced or removed. No user, including administrators or Google Cloud support, can delete or overwrite objects until the retention period expires.
• Cost-effective storage transition: The OLM rule targeting SetStorageClass to COLDLINE executes once an object reaches age: 30 in the STANDARD storage class. Adding sizeAboveBytes: 10485760 (10 MiB) ensures that smaller objects are not transitioned, preventing Class A operation charges from outweighing the cost savings of the Coldline class.
• Automated purging: An OLM rule configured with the Delete action and age: 2555 automatically purges objects once their retention requirement is satisfied, without requiring manual administrative intervention.

Key Advantages and Capabilities

• Regulatory WORM compliance: Irrevocably enforces SEC Rule 17a-4(f), FINRA, and CFTC compliance requirements.
• Optimized transition costs: Excludes small objects where per-operation transition costs negate the benefit of lower at-rest storage rates.
• Asynchronous automated management: Cloud Storage runs lifecycle evaluations continuously in the background at no extra compute cost.
• Inherited duration: Transitions via SetStorageClass do not rewrite data, so object age continues accumulating uninterrupted towards the retention and deletion threshold.

Why This Is Optimal

This architecture directly satisfies compliance and financial constraints by leveraging native, fully managed storage governance controls without custom automation scripts or external scheduling services.