Cygwin just feels "heavy" when all I want is rsync. Without any package management (that I'm aware of) I can't just install rsync and whatever other dependencies it has, I have to put hunderds? more binaries on my system.
[ edit ] if that and cygwin are too heavy, you could request the samba team create a posix windows build of rsync. They had one long ago, but stopped supporting it. That would be a single binary. I suspect they will push back.
I found a Github repo with an older (2017) version of cwRsync that may be from before it went behind a paywall @ https://github.com/billyc/cwrsync-installer
You can run a local console and rsync directly from your window drives (/drives)