Hello,
This is because these files are in use when you try to back them up. You can purhcase the Advanced Open File Option so that you can backup the 'in use' files, i.e., the files which are open and running during the backup.
For more information contact the Sales department .
For any purchase or licensing issues, you can contact our Sales team either by email or telephone as mentioned below:
NOTE : If we do not receive your reply within two
business days, this post would be marked "assumed
answered" and would be moved to "answered
questions"pool.