I use Backup Exec and get the same problem. If a single file is not backed up the monitor lists that backup as failed. Go check the Veritas Web site for updates to the software. You may need to purchase the Open File Options add-on tool that prevents locked files from interfering with the success of the backups.
You should also encourage everyone to be logged out of his or her systems when the backup occurs. This will help insure that the least number of files are opened and locked.
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