backup error
 

When I run the tar backup, it pop up the below error,
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tar: Cowardly refusing to create an empty archive
Try `tar --help' for more information.
krb_sendauth failed: You have no tickets cached
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How to solve? Thanks.

How are you creating the archive??
It should be "tar -cvzf name_of_tarfile.tar.gz /directory/you/want/tarred"