Just to be clear, Dropbox keeps infinite versions of your files- you can go back as far as you like through the Dropbox file browser (select file, choose 'Earlier Versions' and take anything you like)
Only problem is that Unity is a moody sunofabitch about keeping all the files in a project as a set - you need to get a complete 'matched' set of files for it to open and read them.
There are many articles online about how to rebuilt a Unity project tho - which files you need and which it will re-create. If your project was backed-up in Dropbox you CAN get it back - that's the WHOLE point of Dropbox...
johnpeat
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