Problem restoring a backup (


I have made a test with some files (differential backup) : I have made a backup of a directory (with sub directories) then I have added a file, then a backup, then I have renamed the file, and I have made a backup, then I have deleted the file and made a backup. When I try to restore the backup on a new directory all the files are empty.
Am I missing something? It says that the restore is done successfully and also the verification of the backup is fine?
EDIT : I have used the option Maximum compression and Verify files after the backup.
I have Win7x64 (all MS updates done)