Version : Moodle 2.3.2+ (Build: 20121014)

To reproduce:

+ Access into a course:
+ Create a course event in the calendar
+ Go to course administration and start a backup proccess
+ If you uncheck Include enrolled users, when you try to select Include calendar events is disabled, so events are not considered in backup (else you can check or uncheck calendar events)

http://img534.imageshack.us/img534/4672/calendarot.jpg

I think that course events must be independent of enrolled users (like our previous version Moodle 1.8.10)

Hope you can tell me how can I fix it

Best regards
Rosa