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$ /usr/bin/tar -cz /opt/back | /usr/bin/ssh myname@remote.host.com 'dd
+ of=/opt/rback/back.tar.gz'

my $tar = "/usr/bin/tar";
my $taropts = "-cz";
...
my @args = ($tar, "$taropts", "$backupdir", "\|", $ssh, "$user\@$remot
+ehost", "'dd of=$remotedir/back.tar.gz'");

system(@args) == 0 or die "System @args failed: $!\n";