Disaster Recovery for a Critical SaaS

A SaaS company runs its production application in a single AWS Region. The system holds customer accounts, orders, payments, application configuration and uploaded documents. If that Region fails completely the business can tolerate roughly 15 minutes of data loss and 30 minutes of downtime. The company wants a disaster-recovery approach that is significantly cheaper than running a full duplicate production environment. Backups must be automated, encrypted and regularly tested, and the architecture should let the company bring the application up in another Region when it needs to.