Sync Files and Folders Outside Your My Dropbox Folder
The popular cross-platform file-syncing application Dropbox is a hit among Lifehacker readers, but it has one major drawback: It only syncs files placed inside the My Dropbox folder. Here's how to get around that limitation.
In order to sync files and folders that live outside the My Dropbox folder, you need to create a symbolic link between the My Dropbox folder and the folder on your drive that you want to sync. Symbolic links are sort of like shortcuts, so if you had a folder called SyncMe that lived on your desktop, you'd create a symbolic link that made it appear as though SyncMe also lived inside the My Dropbox folder. This process varies depending on your operating system. On Windows:
Use either the JUNCTION utility from Sysinternals, or the MKLINK command built in to Windows Vista and Server 2008, for example:
Another easy way to do this with Terminal is type the ln -s part, then from Finder drag the folder/file that you want into the Terminal window then drag the Dropbox folder and hit return.
Note that an Alias file or folder does not work.
The wiki also offers an Automator workflow to streamline the process if you're using OS X. If this syncing obstacle has held you back from using Dropbox, give these symbolic links a try. If this seems like too much of a hassle, previously mentioned Syncplicity and a few other popular file-syncing apps have user-defined sync folders baked in.