Backup not working

I too am having issues with backup - as a work around i have changed to the "Archive Bit"
this time on a Windows 2003 Server in a domain.

I have been trying to get "timestamp" working but to no avail. some interesting diagnostics below...

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Error encountered copying data from remote source path //[SERVER]/Public ==> /DATA//Public due to permission denial on one or more files.

cp: cannot open '/job_004//./Administration/IT/Licences.xlsx' for reading: Permission denied
cp: cannot open '/job_004//./Design/Chemical Data Sheets/Sodium Hydroxide 30%.pdf' for reading: Permission denied
cp: cannot open '/job_004//./Design/Chemical Data Sheets/Sodium Nitrate crystals.pdf' for reading: Permission denied
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in one of the backup directories some of the files have backedup and others have not with the PD error.
Have checked access permissions side-by-side and there is no difference.
Tried DOMAIN\USER for the directory security
installed pdf and checked the files.
Taken ownership of the files.
Nothing in the Windows Security Logs.
At a loss...