by Ken Task.
According to:
https://docs.moodle.org/401/en/Upload_courses
backupfile
An absolute path to a backup file (.mbz) to import in the course.
(This means the full path to your course, for example /home/yourmoodle/public_html/moodle27/transfer/backup.mbz . If you are unsure of this, look at include_path in Site administration>Server>PHP info.)
So it's not in the sea of files in moodledata/filedir/ but in a directory you create
as in example above: moodlecode/transfer/backup.mbz (your template .mbz backup file)
'SoS', Ken