The user domain\vsa is not a member of the local administrators group on file server: emcunity50.domain.com. The user domain\vsa should have full control to the files & shares you wish to archive.

This looks to be an issue with a check performed against the EMC Unity server and the result is reported incorrectly.
This failed return does not cause issues with normal operations of Enterprise Vault File System Archiving.
Veritas has acknowledged that the above-mentioned issue is present in the version(s) of the product(s) referenced in this article.
There are currently no plans to address this issue by way of a patch or hotfix in the current or previous versions of the software at the present time. While this issue may be resolved in a future major revision of the software at a later time, it is not currently scheduled for any release. If you feel this issue has a direct business impact for you and your continued use of the product, please contact your Veritas Sales representative or the Veritas Sales group to discuss these concerns. For information on how to contact Veritas Sales, please see http://www.Veritas.com .
Please be sure to refer back to this document periodically as any changes to the status of the issue will be reflected here.