use File::Find;
...
# there are directory d:\perl\source\test\öa  and file d:\perl\source\test\öa\ü.txt under \test\

$srcdir="d:\\perl\\source\\test";  
$dstdir="d:\\test2";
finddepth(\&check_and_copy, $srcdir); 

# sub check_and_copy  check the time of file/dir and only copy the updated file/dir to $dstdir