Confusing ...
your CLI backup course ID is 329
Does that course exist?
Make a query of your Moodle DB:
mysql> select id,shortname,fullname from mdl_course where ID=329;
--destination=/path/to/moodledata/temp/backup
I take it that /path/to/ above is hiding the true path? OR did you actually use /path/to/ in command?
Why would you send it to the very directory moodle is using to build the .mbz file?
The resulting .mbz file would need to be seen by the CLI or the GUI in order to restore.
GUI file chooser has no access to that area of moodledata.
Moodle version 4.1.2
http://www.syndrega.ch/blog/#php-and-dbms-compatibility-of-major-moodle-releases
According to above resource, PHP max is 8.1 - you are running php8.3-fpm
I see an addon: edwiser_grader.
Is that up to date and compat with the moodle version you are running? and another block_qtracker?
And another debug shows a different course ID? 335
'SoS', Ken