Redundancy / Cost
Kind: tension
Record: tension:cost-redundancy
Canonical: Schema
"redundancy" (correctness-core layer) is traded against "Cost" (structural-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Cost" and choosing an explicit operating point.
Listed in Tensions, after Failover / Consistency and before Replication / Consistency Lag.