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You are a cloud architect for a financial services company that is subject to strict regulatory compliance for data residency and business continuity. Your primary transaction processing application runs on a Compute Engine instance in europe-west3, and its critical data is stored on the attached regional Persistent Disk. To meet business continuity requirements, you must ensure the application can be recovered in a different region with minimal data loss in the event of a regional outage and follow Google-recommended best practices. What should you do?
Regional Persistent Disks provide synchronous data replication across two distinct zones within a single Google Cloud region. While this mitigates local zonal failures, it provides zero protection against a full regional outage. To ensure cross-region business continuity and comply with data residency boundaries, backup data must be stored externally in a distinct target region.
Google-recommended best practice for cross-region block storage recovery involves implementing automated Snapshot Schedules. Snapshots are incremental by nature, capturing disk deltas to reduce overhead, and they can be configured to replicate to a specific, custom secondary region. This satisfies data residency requirements by keeping data confined to pre-approved regulatory boundaries while decoupling the data from the source region's infrastructure. In a disaster scenario, these snapshots can quickly provision new Persistent Disks in the target region. Custom images only capture boot configurations rather than dynamic application state data, and local zone backups fail the regional resiliency test.
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