I am working with version 0.9.1.
I don't like the performance of the tool...
It uses about 200 MB of RAM to sync about 1 GB and it isn't that fast.
Compared to xcopy (which uses about 3 MB) the performance is bad.
Performing a "silent" copy (without listeners from the UI) may would help a little bit.
Anyway, I like the tool and the backups can wait until morning - when programmers go to bed ;-)