My main Mac can't run Sonoma without OCLP and I'm perfectly happy on Monterey for now, so I will skip.

I already have RSyncOSX, which after quite a bit of Googling and digging seems to be an older app by the same author.

https://github.com/rsyncOSX/RsyncOSX_archived

As opposed to the new:

https://github.com/rsyncOSX/RsyncOSX

Before that, I used to use ARsync:

https://arrsync.sourceforge.net/

https://www.bartbusschots.ie/s/2006/11/26/arrsync-an-rsync-g...

It was, as I recall, nicer still but it's no longer maintained and the x86-32 binary no longer runs.