I use Dropbox more and put my work related documents on so that I can have a copy on my other machine and even on my phone so that I can check them on the go too. But a drawback on these online services is that you manually need to place your files and folder on their folder to sync them.
Suppose you had a document folder on E drive and if you wanna sync them then you need to copy and paste that folder on your Dropbox folder. But here is a simple way which allows you to Sync any folder which is not actually present in your Dropbox folder.
Dropboxifier is a simple to use tool which allows you to sync any folder with your Dropbox account which is outside of it. Just download and run the tool, its an portable tool so no need for any installation, when you run it for first time you need to select your Dropbox folder where it will place a XML file to keep records of your folders. While running it for first time you will get following Alert warning.
Simply click on Yes to go ahead, now name the folder and select it on the left side pane under Add New Link and then click on Dropboxifier.