What all licenses you have installed ?

As per Google translate you are taking backup of a remote machine (Win 2008 R2) on a NAS device.

Have you installed Remote Agent for Windows license ?

Yes, I have installed remote agent for windows license in the remote server. I have restart the service and I start the copy another.

I am getting the error message in the server where I have installed Backup Exec. The copy is the other remote server.

Post the entire error messages.

ESTADO AL FINALIZAR LA TAREA:

El trrabajo ha finalizado: jueves, 29 de noviembre de 2012 a las 11:56:06

Estado al finalizar: fallida

Error final: 0xe000fe3c - No se permite el acceso al dispositivo en esta version de Backup Exec.

Categoróa de error finaL: Errores de seguridad

Hi

Please check link below

http://www.symantec.com/docs/TECH137716

Please download the BE2010 R3 single ISO file of 3.47 gb from link below and ensure you patch it completely to sp2 and few updates after it using live update

Upgrading to BE2010 r3 does not require any extra licenses and is free and will be an place upgrade which will keep all your configuration as it is 

http://trialware.norton.com/files/fc/Backup_Exec_2...

http://www.symantec.com/docs/TECH24882

http://www.symantec.com/docs/TECH72444

Thanks

Yo he actualizado a Backup Exec R3, tanto la consola como el agente remoto. He borrado y creado de nuevo la tarea de copia. El resultado es el mismo. La tarea de copia indica el mismo error.