At a glance, UI. Dropbox is horrible for restoring things - it's possible, but it's definitely not the primary use-case. Especially with something visual, you can go a lot further a lot faster if you can see what it was at each state without having to hit the back button a bazillion times.
What about layering designer-specific functionality on top of dropbox? Use the Dropbox API, people sign up and tell you where in their Dropbox folder they store designs, and you provide specific functionality, like the ability to compare versions of a design in an intuitive way.
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Benefit over using Dropbox (which many people have to use for other files anyways)?
At a glance, UI. Dropbox is horrible for restoring things - it's possible, but it's definitely not the primary use-case. Especially with something visual, you can go a lot further a lot faster if you can see what it was at each state without having to hit the back button a bazillion times.
This was my question exactly.
What about layering designer-specific functionality on top of dropbox? Use the Dropbox API, people sign up and tell you where in their Dropbox folder they store designs, and you provide specific functionality, like the ability to compare versions of a design in an intuitive way.
Hah, funny you should mention that. We just launched our service that does pretty well the same thing, but uses Dropbox: http://www.pixelstew.com
There are a few other people entering this space too, I think it will be crowded in coming months.