How to Add rsync to Git Bash for Windows 10
Download the package: http://www2.futureware.at/~nickoe/msys2-mirror/msys/x86_64/rsync-3.1.2-2-x86_64.pkg.tar.xz
Extract it and move rsync.exe
to %HOMEDRIVE%%HOMEPATH%\AppData\Local\Programs\Git\usr\bin
.
Thank you @fotcorn for your note,
For my case I also need to download the http://repo.msys2.org/msys/x86_64/libzstd-1.4.8-1-x86_64.pkg.tar.zst.
So total of four packages
Copy four libs to the same folder, then use https://github.com/mcmilk/7-Zip-zstd/releases, to extract all of them. After that, copy folder "usr" to "C:\Program Files\Git".
And it works