Why use DropBox at all?
If you've got SSH access into a Linux box at home, all you need to do is get Unison
apt-get install unison-gtk
Deploy Unison on a linux box, and each mobile device. Then use Unison to automatically log into your linux box through SSH and synchronize your data folder.
IMO, it works just as good as DropBox, and it's free.. The only thing it struggles with is filenames in multiple character sets (ie: Chinese / Japanese / English filenames combined into the same folder).
I use Unison to synchronize a Desktop folder on all my Mobile laptops which run both Linux and Windows and other than the Asian filenames that it gets confused with, it works perfectly fine...
Even if you're away from home, if you set your Linux box up so it's facing the Internet with DynDNS and port forwarding (if needed) then you're golden and can just keep using Unison no matter where you are in the world.
No need to throw money away on that dropbox service unless you have cell phones or something that won't run Unison..