[Q] issue with nand backup

I have a problem with the backup - fails to restore, a backup file looks like this: see attach file

i can't restore this backup,it's tell me "system error".... so i trying open "data.ext4.tar.a" on PC, like you see i try UNYAFFS utility, also fail..
-- note, all "normal" files are empty,i already try change extension to file with data, always the same --- ERROR

any idea?

thanks to all who help

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