When you intend to make SugarSync sync folders between computers, it requires you to install SugarSync desktop application on each computer first, which is not that convenient. In this case, a free web app named MultCloud would solve the problem perfectly. With its help, you can sync SugarSync between computers without downloading any client or file. Every operation will be done directly via your browser. Besides, it’s possible to connect SugarSync multiple users on same computer so that every one is able to copy or backup files among different accounts without switching. What you need to do is just adding all accounts in use into MultCloud.
*Update: MultCloud added a special Cloud Sync service now, you can use it to do sync cloud drive task directly. MultCloud provides 8 normal sync ways.