February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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Use full regularly
Barman performs incremental backup by using filesystem hard links for files that haven't changed, hence ensuring every backup always has a full file listing. pgBackRest simply skips unmodified files.
The end result is very similar except that pgBackRest incremental backups become fully dependent on previous full backups. If a pgBackRest full backup is removed, all subsequent incremental and differential backups become invalid. Hence, pgBackRest has safeguards to ensure at least one full backup exists at all times and recommends creating new ones regularly, such as once per week.
Keep this in mind when scheduling backups and choosing which type to use!
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