diff --git a/backup/moodle2/backup_stepslib.php b/backup/moodle2/backup_stepslib.php
index c580e07..503623a 100644
--- a/backup/moodle2/backup_stepslib.php
+++ b/backup/moodle2/backup_stepslib.php
@@ -266,7 +266,7 @@ class backup_course_structure_step extends backup_structure_step {
             'numsections', 'marker', 'maxbytes', 'showreports',
             'visible', 'hiddensections', 'groupmode', 'groupmodeforce',
             'defaultgroupingid', 'lang', 'theme',
-            'timecreated', 'timemodified',
+            'timecreated', 'timemodified', 'legacyfiles',
             'requested', 'restrictmodules',
             'enablecompletion', 'completionstartonenrol', 'completionnotify'));