So I noticed the DropSync 3 executable is an Intel binary. I'd really like to see a native M1 version for my MacBook Pro. I think the gains in efficiency would be noticeable, as well as the saving in battery power.
As an aside, I noticed the native rsync takes about 1/2 the power of the one included in DropSync. Maybe the Intel executable is to blame? But maybe not. I notice the build-in rsync is running an Intel executable as well. Probably because it is being used within an Intel program? I'm not sure about that.
Other than recompiling the program under the latest Xcode, I don't know if any other work in involved. I'd be happy to test it.