Cloud SQL Automated Backup Verification & DR Testing

The Problem and Why It Mattered

I built an automated Cloud SQL backup verification and disaster recovery testing system — performing monthly automated restore tests, verifying data integrity, and producing compliance evidence that backups are both present and functional. The relevant technical and business risk is the cost of leaving this workflow, control, or product boundary unclear, manual, insecure, or difficult to operate. The case study focuses on the decisions used to make that risk manageable.

Objectives and Success Criteria

• Deliver the capability described in the project objective using a maintainable technical design.
• Make the main workflow, control boundary, and operational responsibilities explicit.
• Produce reviewable implementation evidence without publishing confidential values or customer data.

Requirements and Constraints

The implementation had to be reproducible, observable, and safe to describe publicly without exposing operational secrets or private infrastructure detail.

My Role and Ownership

I owned the technical design and implementation described in this portfolio record, including the technology choices, core system boundaries, and the documentation of the resulting approach. Related organisational decisions, vendor operations, and formal certification decisions remain outside the scope of this technical case study unless stated explicitly.

Solution Overview

The solution is built around Cloud SQL, Cloud Scheduler, Cloud Functions. Its implementation is organised as the components below so that the architecture, control points, and operating model can be evaluated separately rather than treated as a list of tools.

Architecture and System Design

The public architecture description follows the path from the initiating user, workload, or operator action through the relevant cloud engineering components. Access boundaries, data or state handling, and operational controls are described at a safe level; secrets, private addresses, and client-sensitive implementation details are intentionally omitted.

Technology Decisions and Trade-Offs

I selected Cloud SQL, Cloud Scheduler, Cloud Functions because they support the project objective and make the critical engineering boundaries explicit. The trade-off is operational and platform complexity: the design depends on documented configuration, controlled access, and ongoing review rather than assuming that a managed service or framework removes engineering responsibility.

Implementation Walkthrough

The following implementation notes describe the components that matter most to the project outcome. They are intentionally focused on technical decisions and operating behaviour instead of reproducing entire source files or sensitive configuration.

Implementation: Automated Restore Testing

Cloud Scheduler triggers a Cloud Function on the first Sunday of every month. Identifies all production Cloud SQL instances, selects the most recent backup, initiates a clone to a test instance in a dedicated dr-test VPC with no external connectivity, then runs a validation query suite.

Implementation: Data Integrity Validation

Validation queries check: row counts against expected baselines for critical tables; presence of the most recent production record; schema consistency; and foreign key integrity across the three most critical relationships.

Implementation: Evidence, Alerting & Cleanup

If any check fails, PagerDuty is notified with the instance name, backup timestamp, and failing check. Test results written to BigQuery and a locked Cloud Storage bucket as compliance evidence — part of HIPAA and ISO 27001 evidence packages. Test clone deleted after validation.

Challenges, Failures and Corrections

This portfolio record does not invent deployment failures, client incidents, or corrective actions that are not supported by the published project evidence. Where operational details are confidential or were not captured for public release, the case study documents the design boundary and lesson instead of presenting an unsupported narrative.

Security, Compliance and Risk

The public record avoids secrets, customer data, and private infrastructure details. The relevant security controls, access boundaries, and operational risks are addressed in the implementation notes where they are material to the project.

Testing, Validation and Evidence

The evidence published for this project is the documented implementation, its stated architecture and controls, and the portfolio record. The published record documents the implemented architecture, the core controls, and the technology choices that can be reviewed without exposing confidential operational data. Claims are limited to the implementation details and outcomes documented in this case study.

Results and Evidence

The published record documents the implemented architecture, the core controls, and the technology choices that can be reviewed without exposing confidential operational data.

What I Learned

This project reinforced that cloud engineering work is not a technology checklist. The durable value comes from making boundaries, trade-offs, ownership, and evidence clear enough for another engineer or stakeholder to review and operate the system responsibly.

What I Would Improve Next

• Expand automated validation around the most important workflow and control boundaries.
• Add or deepen operational evidence, such as dashboards, test artefacts, or an architecture diagram where it is safe to publish one.
• Review the design against the next expected scale, reliability, and governance requirement before extending the system.

Final Takeaway

This cloud engineering case study addresses a defined technical problem through Cloud SQL, Cloud Scheduler, Cloud Functions. It demonstrates my ability to turn requirements into an explainable design, implement the important controls, and document outcomes and limitations without overstating what the evidence proves.