I am currently using Yosemite and have bought a new Mac also using Yosemite.
I used the Migration Assistant to transfer all my programs to my new Mac.
However for some reason, GarageSale appeared as though it was a new application and none of my templates were transferred over. I did not select to transfer user documents etc, only applications.
Prior to this I have always just coped the GarageSale folder within Application Support.