Create a course Edit any section. Check the "custom" checkbox and add FIVE blank spaces as the name. Save. Go to course backup page. Verify that no errors happen. Verify that you see the edited section empty (without any label). Complete the backup without problems. Restore the just created backup. Advance till the sections are activities are shown. Verify that no errors happen. Verify that you see the edited section empty (without any label). Complete the restore without problems. Edit the "empty" section in the restored course. Verify that it contains the same FIVE blank spaces introduced originally in step #3.