@franz - I just received the G3 controller and I setup it as a new controller ( I did not use the transfer option ) and I want Rachio to transfer only the water usage for the months of April and May. I configured manually the other options. The new controller is up and running without any issue in an Ubiquiti network. 
Great to hear!
We do not transfer water usage from controller --> controller. Lots of bad things would happen 
If you’d like to download your usage data app.rach.io will allow you to download a CSV for current/previous months.
