Hi,
Please refer to the link below which gives more information about Windows 2003 Service Pack 1 and Backup Exec 10.0
Important information regarding Backup Exec for Windows Servers and Microsoft Windows 2003 Service Pack 1
http://support.veritas.com/docs/276538
You may try running the backup to a Backup to Disk folder instead of a tape and compare the results.
"How to correct slow backup performance, slow virus or pre-job scans, and agent initialization problems on fragmented Windows NT, Windows 2000, and Windows 2003 server partitions "
http://support.veritas.com/docs/237444
What Backup Exec settings can be modified to reduce the amount of time it takes for a backup to run?
http://support.veritas.com/docs/249090
For further confirmation you may try running the backup using NTBackup.
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