This really isn't a Netbackup issue it is a windows authentication
issue.  Are these machines on a domain?  If you use the local admin
account on the Netbackup Media server for the Netbackup client service
and have that same username and password on the \\UNC server that might
work.  You also might try some sort of shared domain / system account
specifically for this purpose which is probably the most secure way to
go about this.  The least secure way (but quickest) would be to modify
the properties of the \\UNC Share to allow guest access (and enable the
guest account) but that would also allow ANYONE to access this data.

-Jonathan 

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