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Disaster recovery usually fails at restore time, not backup time. Every team has backups. Most teams have never restored from them under realistic conditions. The gap between “we have a backup strategy” and “we can recover in production” is where customers experience downtime, regulators ask uncomfortable questions, and engineers discover that the runbook references a tool that no longer exists.

The articles in this collection treat disaster recovery as a tested capability rather than a documentation artifact. Recovery Time Objective (RTO) and Recovery Point Objective (RPO) are not aspirational numbers — they are commitments that have to survive a real incident at 2 AM with half the team on holiday. Targets that look reasonable in a planning session quietly become impossible when the actual restore depends on a step nobody has rehearsed.

Entity Framework Core is the primary ORM for .NET, and its surface area extends well beyond basic CRUD. This collection examines EF Core from a practitioner’s perspective: migration design, model configuration, performance patterns, and the architectural decisions that determine whether your data layer stays maintainable as systems grow.