[Book “Learn PostgreSQL”] I completed the chapter about physical backups. They are performed by coping PGDATA, tablespaces and WALs to another machine or different directory. You can leverage a buid-in postgres command pg_basebackup or 3rd party tool pgBackRest. Physical backups require careful approach to configuration e.g. connections values and hba rules.
Point in time recovery is achieved by streaming WAL segments to another ‘archive’ location e.g. another computer or bucket. PITR allows cluster to be ‘replayed’ up until selected timestamp.