Archive Student Curriculum

I am using the archiving options and archvie anything older than 120 days (it was previously 180) and before that a year. I have found that it is not always archiving the student curriculum.   I am not sure why.   It does for some of the people and then not others.

Does archiving look first and see if a student is not active and not archive anything if they are?  Why wouldn't it archive the student curriculum and student courses at the same time it's marking the student inactive?

Any thoughts?