Backup Failure - preserving times invalid argument

Hi all,

I'm trying to configure backup from a readyNAS 2100 to a DNS-323 DLINK NAS server through a WIN/NAS (timestamp) configuration.

WIN/NAS configuration test works fine on the readyNAS.

But when the backup job 's launched, It fails with the following errors on each file :

Error encountered copying data from source path /PRIVE/ ==> //192.168.3.4/Volume_1/TEST due to unknown reason. Please see log.
...
cp: preserving times for '/job_001//TEST/./Ancien Formulaire/Anciennes formules/Anciennes formules/Crème 60 ml': Invalid argument
cp: preserving times for '/job_001//TEST/./Ancien Formulaire/Anciennes formules/Anciennes formules/Gel color YP line': Invalid argument
cp: preserving times for '/job_001//TEST/./Ancien Formulaire/Anciennes formules/Anciennes formules': Invalid argument
...

does anybody have a clue or idea?
thanks
Thomas