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For backing up a PostgreSQL cluster, the following tools are often used:

• pg_basebackup — built-in tool for creating a physical copy of the entire cluster, suitable for basic backups.
• pg_dump/pg_dumpall — for logical backups of individual databases or the entire cluster.
• Barman — specialized tool for managing backups and recovery of PostgreSQL, supports incremental backups and WAL archiving.
• Wal-G — modern backup tool with support for cloud storage, efficient for large data volumes.
• Patroni + Etcd/Consul — for cluster management and high availability, in conjunction with backups.

Depending on RTO/RPO requirements and infrastructure, a combination of these tools is chosen. For example, critical systems use pg_basebackup with WAL archiving via Barman or Wal-G to ensure precise recovery up to the point of failure.