Unable to create backup to network drive

Hi, I have a Western Digital My Book World Edition; 2 TB networked external drive.

 

When I try to create a system restore point, I get the following error:

 

 

-Error E7C3000F: Device \\?\SymantecSnapshot0 cannot read 12292 sectors starting at LBA 2828304.
--Error EBAB03F1: The request could not be performed because of an I/O device error.
(UMI:V-0-1987-15)

 

-Error E7C3000F: Device \\?\SymantecSnapshot0 cannot read 12292 sectors starting at LBA 2828304.--Error EBAB03F1: The request could not be performed because of an I/O device error.
(UMI:V-0-1987-15)

 

I've tried reinstalling Ghost and it doesn't work; I still get the same error. I am able to back up documents/etc. to the networked drive (Drive Z:) with no issues, but run into this error when trying to create a system restore point/"My Computer Backup"

 

Any ideas?

 

Thanks