Please add to my ideas for backup test cases (where we verify that our backup solution actually works).

Test #1:
single file
backup ok (backed-up file copied to backup location).

Test #2:
restore ok (backed-up file copied to original location).

Test #3:
directory backup ok (backed-up folder and contents copied to backup location).

Test #4:
directory restore ok (backed-up folder and contents copied to original location).

Test #5:
software re-install required
revert to previous configuration using backed-up settings.