Hello, I am using PostgreSQL-9.6, trying to do basebackup on a hot standby with archive mode set to always. However, I found there is no backup history file (*.backup) generated in the archive destination directory after `pg_basebackup`, which is not the case if I do the same thing on the primary. Is this as expected? If so, in which case should I do backup on primary and in which case should I do it on standby? Thank you in advance! Magodo