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If we inadvertently implied that pgBackRest cannot function from an external centralized backup server, that is not actually the case. However, setting it up to operate in this manner is actually somewhat complicated. Unlike Barman, which leverages rsync and PostgreSQL streaming replication, pgBackRest uses its own communication protocol between systems.
This means it must be installed in a client to server model, where pgBackRest is installed on both systems and configured separately on either. The configuration itself is not especially difficult, but this kind of configuration is beyond the scope of this particular chapter. The pgBackRest documentation actually has a comprehensive explanation of how this model works and ...
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