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In my system, I have postgresql 12 and barman v2.13. I have a few backup disk around 1 TB and i have currently added new DB which has 5 TB. Previously my PostgreSQL had no more than 400 GB.

i think Barman can not compress backup DB, right? So could i take backup only specific DBs? Is pgbacktress similar?

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Barman transparently uses pg_basebackup, so you can't backup only a specific database, as pg_basebackup works at the cluster level.

Barman can do compression of WAL files, but not of the base backup.

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