Unless you hake the experience needed, I would say just stick to Dropbox.
Or, one of the other cloud services that allow sync.
If both of you are running winnows 7 or beater, you should think about the Microsoft OneDrive. You can get a free
OneDrive accountant using your Microsoft email account. I think you both could use the same account. The issue would be the email account.
Actually, I have two emails with Microsoft. One is on Hotmail and the other on Live.
So maybe you could use the user ID just for the cloud service and not e-mail.
Here is a link that may help you.
Five tools to help sync more than one cloud storage service By use of the right cloud service, either one of you could work on a project at any time. The cloud service is almost as fast as FTP. With the right kind of sync software, it is easier than FTP.