Hi Luca,
To backup a file "DLO" you have to add individually to the backup selection list.
You cannot use any wildcard characters.
However, you may launch a product enhancement request using the following link:
http://enhancement.veritas.com
Regards,
Ashutosh
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.