Backup Device Errors

Dear 

i neede a copy of backp on tap to keep it offline 

so i configured media sed as Keep Data Infinity -Dont Allow Overwrite  as show in attatch 

when i create bacup i found this error 

Job ended: Thursday, January 23, 2014 at 3:24:58 PM
Completed status: Failed
Final error: 0xe00084c8 - The backup storage device has failed.
Final error category: Backup Device Errors

For additional information regarding this error refer to link V-79-57344-33992

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more information ....I'am   Erased a tap drive before start backup job