This is a step in the right direction for them, but in order for Dropbox to be the go-to provider for small businesses they're going to need to integrate better into the every day lives of people at those companies. Features like volume shadow copy and image based backup, local backup, centralized management, and reporting are common features provided by competitors targeting the small business market.

Dropbox was designed for consumers and I think the core experience lends itself well to them. They certainly have that market nailed down. But there's a reason there is a huge market they've left untouched and I don't think it's going to be easy for them to enter it without some fundamental changes to how their product operates.

Disclaimer: I work for a small online backup provider.