Hi,
We apologise for the inconvenience caused because of the delayed response. Please let us know if your issue / problem is resolved so that we can mark this case as "assumed answered" and move it to "answered threads" pool.
However, if the issues still persist then refer to the steps mentioned below:
Create a new user account. Assign Local Administrator and Domain Administrator permission to that user account
Make this user local administrator of NAS server
Start Backup Exec > Tools > Backup Exec services > Check "change service account information" option > enter newly created user name and password > Ok > Stop all services > Start all services
Now try creating Backup-to-disk folder on NAS server and verify the result.
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You can also upgrade to v9.1 from v9.0 free of cost:
Download link:
http://seer.support.veritas.com/docs/264658.htm
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NOTE : If we do not receive your intimation within two business days, this post would be marked "assumed answered" and would be moved to the "answered threads" pool.