On 10/16/23 00:26, Kyotaro Horiguchi wrote:
At Mon, 16 Oct 2023 13:16:42 +0900 (JST), Kyotaro Horiguchi 
<horikyota....@gmail.com> wrote in
Just an idea in a slightly different direction, but I'm wondering if
we can simply merge the content of backup_label into control file.
The file is 8192 bytes long, yet only 256 bytes are used. As a result,
we anticipate no overhead.  Sucha configuration would forcibly prevent
uses from from removing the backup information.

In second thought, that would break the case of file-system level
backups, which require backup information separately from control
data.

Exactly -- but we do have a proposal to do the opposite and embed pg_control into backup_label [1] (or hopefully recovery_control).

Regards,
-David

[1] https://www.postgresql.org/message-id/1330cb48-4e47-03ca-f2fb-b144b49514d8%40pgmasters.net


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