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Document Global Service Disaster Recovery

Steve Xuereb requested to merge cells-global-service-dr into cells-global-service-spanner

What does this MR do and why?

What

Research and document the disaster recovery plan for Global Service.

The Disaster Recovery plan only accounts for potential logical application errors where it deletes/logically corrupts the data. Since we are going with a Multi-Region write-read model we don't have to care about storage/compute recovery since that would be handled for us.

Why

To have some kind of plan for recovery.

Reference: #454057 (closed)

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