A friend in the US has been writing songs that we have been recording using Cubase Artist 7.5. As I live in the UK, we have been using Dropbox to collaborate and this has worked very well for us. The 5 hour time difference just about eliminates any conflicts but when one does arise, Dropbox gives us a ‘Conflicted Copy’ and leaves it up to us to straighten out, and that is pretty easy to do. We did upgrade Dropbox to the gazillion megabytes so we don’t have to worry about managing our space.