An enterprise analytics application deployed in Google Cloud processes financial transaction logs. The compliance team mandates that all log data must strictly adhere to data residency regulations and never leave the europe-west3 (Frankfurt) location. The data access pattern is characterized as follows: Data is accessed continuously with high frequency during the first 30 days after generation. Between 31 and 90 days, data is queried approximately once a month for reconciliation reports. After 90 days, data is rarely accessed but must be retained until it reaches 365 days of age for auditing purposes. Which Cloud Storage bucket configuration and lifecycle management strategy should you implement to minimize costs while complying with all requirements?

Create a regional Cloud Storage bucket in europe-west3 with the Standard storage class. Configure Object Lifecycle Management rules to transition objects to Nearline storage after 30 days, transition to Coldline storage after 90 days, and delete objects after 365 days.: ### What the Recommended Solution Is This architecture leverages a **regional Cloud Storage bucket** in `europe-west3` combined with automated **Object Lifecycle Management** rules. It places objects initially in **Standard storage** and progressively shifts them through **Nearline** and **Coldline** storage before deleting them at the end of their compliance retention window. ### How It Meets Every Requirement - **Data Residency Compliance**: By selecting a **regional bucket** in `europe-west3`, all object data at rest is guaranteed to remain strictly within the Frankfurt region, satisfying the regulatory requirements. - **First 30 Days (Continuous Access)**: Storing active data in the **Standard storage class** eliminates data retrieval fees and provides the lowest latency and optimal throughput for frequent reads. - **Days 31 to 90 (Monthly Access)**: Transitioning data to **Nearline storage** at day 30 drastically reduces the at-rest storage cost while aligning perfectly with the once-per-month access frequency and 30-day minimum storage duration. - **Days 91 to 365 (Rare Access)**: Moving data to **Coldline storage** after 90 days further decreases at-rest storage charges for rarely accessed historical logs that meet the 90-day minimum storage threshold. - **Retention and Cleanup**: Setting an automatic **Delete action** at 365 days prevents unnecessary ongoing storage costs once the mandatory retention window has elapsed. ### Key Advantages - **Strict Regulatory Conformance**: Restricts data replication exclusively across zones in a single region without cross-border transit. - **Granular Cost Optimization**: Progressively lowers per-gigabyte storage pricing based on decaying access frequency. - **Automated Lifecycle Transitions**: Removes operational overhead and human error through serverless policy enforcement. - **Optimized Data Retrieval**: Avoids early deletion and minimum duration penalty fees by matching transitions to storage class minimum periods. ### Why This Is Optimal Using a regional bucket satisfies data residency mandates without incurring multi-region egress or replication overhead. Matching the data lifecycle transitions to the exact access cadence (Standard for hot data, Nearline for monthly access, Coldline for rare access) minimizes total cost of ownership (TCO).

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Cloud Storage Tiers Lifecycle Optimization

Section: Data storage allocation

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An enterprise analytics application deployed in Google Cloud processes financial transaction logs. The compliance team mandates that all log data must strictly adhere to data residency regulations and never leave the europe-west3 (Frankfurt) location.

The data access pattern is characterized as follows:

Data is accessed continuously with high frequency during the first 30 days after generation.
Between 31 and 90 days, data is queried approximately once a month for reconciliation reports.
After 90 days, data is rarely accessed but must be retained until it reaches 365 days of age for auditing purposes.

Which Cloud Storage bucket configuration and lifecycle management strategy should you implement to minimize costs while complying with all requirements?

Create a regional Cloud Storage bucket in europe-west3 with the Coldline storage class as default. Configure Object Lifecycle Management rules to transition objects to Archive storage after 90 days and delete objects after 365 days.

Create a zonal Cloud Storage bucket in europe-west3-a with the Rapid storage class. Use Cloud Functions triggered by Cloud Tasks to manually rewrite objects into Archive storage after 90 days and delete them after 365 days.

Create a regional Cloud Storage bucket in europe-west3 with the Standard storage class. Configure Object Lifecycle Management rules to transition objects to Nearline storage after 30 days, transition to Coldline storage after 90 days, and delete objects after 365 days.

Create a multi-regional Cloud Storage bucket in the eu location with the Standard storage class. Configure Object Lifecycle Management rules to transition objects to Nearline storage after 30 days, transition to Archive storage after 90 days, and delete objects after 365 days.

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Cloud Storage Tiers Lifecycle Optimization

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