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I'm having a difficult time creating a backup-to-disk folder in Symantec Backup Exec 12.5 and Backup Exec 2010. The backend storage is a Nexenta/ZFS-based NAS filer sharing the volume via CIFS. I've also seen the issue on other *nix-based NAS devices.

I've attempted mapping the drive, providing the full paths to the folder, etc. I can browse to the share just fine from within Windows, but Backup Exec fails to create the B2D folder with different variants of a Unable to create new backup folder. Access denied error.

I've attempted creating service accounts in Backup Exec to handle the authentication, but nothing seems to work. What's the key to making this work?

Update: Here's the event viewer log:

An error occurred while processing a B2D command.
 Changer: CreatePath() CreateDirectory1 failed (\\storage1\vol1_backup\).  Error=5 
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check this out to see if anything there helps? – Ben Pilbrow Dec 30 '10 at 20:30
It was close, but I think there are some other issues. This shouldn't be so difficult. – ewwhite Dec 31 '10 at 13:35
up vote 1 down vote accepted

I found the solution by using the Symantec Backup Exec Backup-to-Disk Test Tool found here:

This allowed me to debug the issue and realize that passthrough authentication was being used in the effort to create a B2D folder. In my case, I was logged into the backup server as DOMAIN\Administrator. On the Nexenta system, I needed to create an Active Directory ID mapping of Administrator@DOMAIN.COM == root (or any other local Nexenta user), then create an ACL for that user for the CIFS share I was presenting to Backup Exec.

Basically, if you're using a NAS device that's not Windows based, you need to allow permissions from Backup Exec; either by leaving the share entirely open or tweaking the ACLs to fit the account that Backup Exec is running as.

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