thx replies ,
but I still have problem , what my case is I have tape that have data created by other backup tool , I don't what to use tar to backup but do not overwrite the existing data , I tried -r , -A , ( tar -zcvf -A device file ) and ( tar -zcvf -r device file ) , I found that the existing files are not overwrited but the new files do not write to it , can advise what is wrong ? thx
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