Setup of a new server in Barman
===============================

As mentioned in the “Design and architecture” section, we will use the
following conventions:

-  ``pg`` as server ID and host name where PostgreSQL is installed

-  ``backup`` as host name where Barman is located

-  ``barman`` as the user running Barman on the ``backup`` server
   (identified by the parameter ``barman_user`` in the configuration)

-  ``postgres`` as the user running PostgreSQL on the ``pg`` server

..  IMPORTANT::
   a server in Barman must refer to the same PostgreSQL instance for the whole backup and recoverability history (i.e. the same system identifier). **This means that if you perform an upgrade of the instance (using for example `pg_upgrade` , you must not reuse the same server definition in Barman, rather use another one as they have nothing in common.**