Ok ...
Moodle 3.7.3+ (Build: 20191115)
Backed up and downloaded backup mbz file.
Uncocmpreessed the backup file.
xml files are roadmaps to things in backups/restores.
Only thing I can find in xml files that has a 'locked' tag in all the XML files
is in the following:
Kens-MacBook-Pro-2:testbackup kentask$ fgrep 'locked' ./*.xml
./grade_history.xml: <locked>0</locked>
./grade_history.xml: <locked>0</locked>
./grade_history.xml: <locked>0</locked>
./grade_history.xml: <locked>0</locked>
./grade_history.xml: <locked>0</locked>
./grade_history.xml: <locked>0</locked>
./grade_history.xml: <locked>0</locked>
./grade_history.xml: <locked>0</locked>
./grade_history.xml: <locked>0</locked>
./grade_history.xml: <locked>0</locked>
./gradebook.xml: <locked>0</locked>
./gradebook.xml: <locked>0</locked>
./gradebook.xml: <locked>0</locked>
Soooooo .... ???? ...
'SoS', Ken