Nope. Openrsync lacks the options of rsync for making exact copies. Moreover, the OpenBSD file systems are unable to store all metadata that can accompany fil

Nope. Openrsync lacks the options of rsync for making exact copies. Moreover, the OpenBSD file systems are unable to store all metadata that can accompany files in Linux filesystems or Windows filesystems, so that is the likely reason for removing the rsync options. I also doubt that the developers of an utility for OpenBSD are also interested in taking care to preserve file metadata when copying to/from Windows, because the metadata access API is not portable, so a complete "rsync" utility must include specific code paths at least for Windows, for Linux and for FreeBSD. I do not know if the API of MacOS is also specific to it, or it is compatible with anything else.