Hello,
You can upgrade from Backup exec 7x to version 10. Refer to the following doc for more information on this:
Title: Upgrading from Backup Exec 7.x for Windows NT to Backup Exec 10.0 for Windows Servers
http://support.veritas.com/docs/265163
Hope this information helps. In case you have any more queries on this, do not hesitate to write back at the forums.
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Regards.