The "database size" is going to be your data directory, MINUS your pg_wal
directory, MINUS unlogged/temp relations, and MINUS things that are not
needed for recovery (i.e. all the small pg_ directories such as
pg_subtrans). The "database backup size" is how much of that 3GB is part of
*this* backup - for a full backup, the number will be the same, for diff or
incr, it will be a lot less. The "repo backup size" on the last line is the
compressed size of the previous "database backup size"
How to correlate the pgbackrest ( info) database size, database backup size
> and repo1 backup size and actual du output on DB cluster.
>
You cannot, really, without deep knowledge of things like which files on
disk map back to unlogged tables. However, du on the datadir minus all pg_
dirs should get you in the ballpark. As a quick example:
cd $DATADIR
du --summarize * | awk '!/pg_/{x=x+$1}END{print x}' | numfmt --to=iec
Cheers,
Greg
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