by Ken Task.
One at a time. There must be a reason you are asking ... like you are not seeing 'over a thousand course' backups (.mbz files) in designated directory?
In that case, check moodledata/temp/backup for failed backups ... evidenced by a 'hash' named directory that contains no 'backup.mbz' nor a moodle_backup.xml - but does contain other xml files and related directories.
Check web server error logs also.
If going further ... would be a good idea to share version of Moodle and set up of your system(s) as well as how hosted (where wouldn't hurt either).
'SoS', Ken