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Backups with cross-site replication

Before the Operator version 1.19.0 Backups were supported for the primary (managed) cluster only. Now backups can be taken on primary and replica clusters.

Still, backups on cross-site configurations have some specifics.

  • Even though you can run backups in unmanaged clusters, you can’t run restores on them.
  • Even if the backup is started in primary (managed) cluster, most likely it will be taken from a secondary instance, even if such instance is on a separate cluster, because Percona Backup for MongoDB (PBM) automatically assigns lower priority to primary member to avoid affecting the write performance. This can be overwritten with custom PBM configuration.
  • PBM configuration is shared across all clusters. The Operator will reconfigure PBM every time it runs a backup, and setting PBM configuration in one cluster will affect other clusters too. For example, setting backup.configuration.backupOptions.oplogSpanMin to 2 in a secondary cluster will be applied to primary cluster as well.
Last update: 2025-01-21