CursePress reliability and additional functions

I recently purchased CoursePress Pro and have had my files deleted tonight. THankfully someone is trying to restore my lost data, but in the meanwhile I have a few additional questions.
How often does CoursePress crash?
Is there backup I can do to ensure it doesn't crash?
Is there a limit on data I can post?
How do I make 1 test of 25 questions that is timed?
Can I add a "assignment upload" button?
How do I track students activity?
How long before a student's profile times out due to no activity?
I looked up few Stanford Univeristy MOOCS. Do they use WordPress? If yes, is it CoursePro?
Please answer my questions as I am seriously debating proceeding with CoursePress.