Log, aka WAL (version 7.1, 2001) • Continuous backup & Point in Time Recovery (8.0, 2005) ◦ Physical Hot Base Backups and WAL archiving for Disaster Recovery (DR) • Continuous recovery through WAL shipping (8.2, 2006) ◦ Warm standby replicas for High Availability (HA) • Streaming replication with Hot Standby replicas (9.0, 2010) ◦ Synchronous replication at transaction level (9.1, 2011) • Physical Hot Base Backups from a Hot Standby replica (9.6, 2016) • NOTE: pg_dump takes logical backups (not for business continuity)