Can take filesystem bkp of pg data folder when server is running

From: PG Doc comments form <noreply(at)postgresql(dot)org>
To: pgsql-docs(at)lists(dot)postgresql(dot)org
Cc: vidyasagarps(at)gmail(dot)com
Subject: Can take filesystem bkp of pg data folder when server is running
Date: 2018-01-23 06:00:15
Message-ID: 20180123060015.7407.32905@wrigleys.postgresql.org
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The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/10/static/backup-file.html
Description:

I am running postgresql 10 on mac and was experimenting on backup and
restore features of PG 10
I certainly can take FS backup of the cluster with TAR when server is
running and with ACTIVE client connections [dummy begin; statement]

This seems against the documented explanation for FS backup method and its
limitation.

Is there something I am missing here?

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