A detailed comparison of four migration strategies for moving PostgreSQL databases from the Crunchy Data PostgreSQL Operator to the Percona Operator for PostgreSQL on Kubernetes. The four methods covered are: shared pgBackRest repository (standby cluster), streaming replication via pg_basebackup, backup and restore, and reusing the existing persistent volume. Each approach is evaluated across dimensions including downtime, rollback safety, network dependencies, object storage requirements, cost, business continuity risk, DNS caching issues, and cross-cluster migration support. The persistent volume reuse method has zero additional cost but causes full downtime and cannot migrate to a different cluster, while the standby-based methods allow near-zero-downtime cutover but require running two clusters simultaneously.
