LAN Backup on DNS-320L

Hi,
I am using a DLINK NAS (DNS-320L) and I am trying to set up a local back up of a folder on OS X and I keep getting a fail when I test the link out. I have managed to get it working on a PC, so I know I am on the right path.
I'm obviously in 'Local Backups'. I have 'LAN Backup' checked and have the folder option checked. The IP of the NAS is 192.168.0.15 and the folder I'm trying to backup on the Mac is /Users/joelcampion/Documents, and is set as a shared folder. Therefore, I have tried \\192.168.0.15\User\joelcampion\Documents and this is when I get the fail. I have tried with and without the account details (username and password) and I've added an extra '\' at the end as well.
My questions are, am I doing this correctly? Are there any obvious things I'm doing wrong? Or does this just not work on a Mac. Do my folder paths look correct? Is there a folder before /Users that I should be adding to the link?
Thanks
Joel

Thank you.  I was able to test and successfully backup to several network shares in my environment.
After reviewing the logs it does appear to confirm a permissions issue:
10:51:50.286|ERROR|54|Rim.Desktop.BackupRestore|0|Read Access to backup file failed. The backup folder is read only.
Would it be possible to create a new test share permissioned for everyone to have a full acccess to and test?  You could then apply permissions from there to narrow the issue.
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