Backup error code 0x80070490

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  Hello please help.  I am getting the error code 0x80070490 every time I try to backup to an external HD.  I cant go back and do a reset, it's been happening for a very long time.  I have tried the resolution that Olaf advised the chkdsk /r.  It didn't work.  

  The Microsoft technical folks tell me that it is a missing registry key  in HKEY_Local_Machine/System\CurrentControlSet\Control\StorageDevicePolicies  but I really hesitate to try to look in the registry alone.  Thanks and Help!  

  Friday, March 20, 2015 3:25 PM