pg_basebackup progress at 100% for many hours, but still writing data to disk

From: Michael Jendryke <michael(at)jendryke(dot)de>
To: pgsql-novice(at)lists(dot)postgresql(dot)org
Subject: pg_basebackup progress at 100% for many hours, but still writing data to disk
Date: 2020-03-05 09:49:48
Message-ID: 553940784.301036.1583401788498@email.ionos.de
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Dear all,
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I am running pg_basebackup with the following command on my Win10 machine:
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"C:\Program Files\PostgreSQL\12\bin\pg_basebackup.exe" --pgdata=R:\PG_BASEBACKUP\20200304 \
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--format=t \
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--wal-method=stream \
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--gzip \
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--compress=6 \
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--progress \
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--verbose \
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--status-interval=600 \
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--username=postgres
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With the following output:
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<br>pg_basebackup: initiating base backup, waiting for checkpoint to complete
<br>pg_basebackup: checkpoint completed
<br>pg_basebackup: write-ahead log start point: 3A6/59000028 on timeline 1
<br>pg_basebackup: starting background WAL receiver
<br>pg_basebackup: created temporary replication slot "pg_basebackup_15532"
<br>3067352123/3067352123 kB (100%), 0/1 tablespace (..._BASEBACKUP\20200304/base.tar.gz)
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As you can see, I turned on --progress to see when my backup is done. However 100% is reached for many hours already and the kB count keeps on increasing. I can see that data is being written to disk and that base.tar.gz gets larger and larger. The initial number that pg_basebackup presented to be 100% was ~2.2 TB, which I assume is wrong, as the datadir is ~3.5TB.
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There is no additional activity on the server, just me, running pg_basebackup.
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PostgreSQL version 12.1
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Thanks!
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Michael
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