I'm really happy with the new implementation of course backup since moodle 2.0. Unfortunately there is one drawback. When you decide to save the backup files in a "specified directory for automated backup" it's hard to find the backup file which belongs to a specific course. It's simple when the course still exists but it's impossible when the course was deleted because you don't know the courseid.

The filenames are like: backup-moodle2-course-445-20110713-0929.mbz
445 is the courseid.