Hi Leandro,
Just a note to let you know one thing, perhaps (very) important for you : when deleting a course in Moodle (not sure about moosh or other plugins), logs for this course are not deleted.
They are only deleted by the dedicated scheduled task, if you defined a retention time. If configured to keep indefinetly, you still have logs about old and deleted courses (and it can sometimes take a lot of place in DB).
You can also have old backups taking much disk place...
HTH,
Séverin