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chdir $folder or die "Can't chdir to '$folder': $!\n";
my $ret = system("tar -cvzf $tar_file ."); # tar and zip on the fly
    and die "Couldn't create tarfile '$tar_file': $!\n"; # 'and', not 
+'or'

my @ary = splice(@srcfiles,0,1024);
my $ret = system("tar -cvf $tar_file @ary") # tar only, no update on '
+z'
...
    $ret = system("tar -uvf $tar_file @ary");
        and die "Couldn't update '$tar_file': $!\n";
}