I can see from searching the forums this is an extremely commonly desired feature however I couldn't find any information on development. I recently purchased Dropbox Pro not considering that I couldn't simply sync my external drive. Unfortunately with my small SSD much of my files are stored on a removable drive which greatly reduces the utility of Dropbox for me.
Can anyone provide information about whether this is a feature that is being considered or even worked on? I am partial to Dropbox but I (and many others it seems) am trying to decide if I should explore other backup options that fit my needs in this regard instead Dropbox.