Backup, Restore, Recovery, WAL, pg_dump, and pg_basebackup
Learn how PostgreSQL data protection works and how to build backup and recovery strategies that stand up in production.
Inside this chapter
- Backups Are Not Optional
- Logical and Physical Backup Approaches
- Simple Example
- WAL and Recovery Thinking
Series navigation
Study the chapters in sequence for the clearest path from beginner PostgreSQL concepts to advanced query design and production operations. Use the navigation at the bottom of every page to move chapter by chapter.
Backups Are Not Optional
Critical systems need reliable backup and recovery workflows. Data may be lost through operator error, application bugs, failed releases, storage failure, or corruption. A database without a tested restore path is not operationally safe.
Logical and Physical Backup Approaches
| Approach | Typical Tool | Best Fit |
|---|---|---|
| Logical backup | pg_dump | Schema and data export, migration, smaller systems |
| Physical backup | pg_basebackup | Cluster-level recovery and replication setup |
| WAL-based recovery | Archived WAL plus base backup | Point-in-time recovery for production systems |
Simple Example
pg_dump -U postgres -d appdb > appdb_backup.sql
psql -U postgres -d appdb_restore -f appdb_backup.sqlThis is a good starter workflow for learning, but advanced environments also consider retention, encryption, offsite storage, restore validation, and point-in-time recovery objectives.
WAL and Recovery Thinking
Write-Ahead Logging, or WAL, is central to PostgreSQL durability and recovery. Advanced teams learn how WAL supports crash recovery, replication, and point-in-time recovery. That knowledge is essential for operating PostgreSQL safely at scale.