disaster recovery

Four tiers, four bills. Stating RTO and RPO per tier turns a vague resilience wish into a decision leadership can actually price, and the testing story is where candidates fold.

Two artifacts hide under 'Kubernetes backup' and they recover different things. Interviewers grade the misses: volume bytes, encryption keys, and everything that never lived in etcd at all.

The classic napkin-math question. The number in the prompt is the question, and candidates who draw the architecture before doing the arithmetic design something the physics forbids.