[mark212]

This isn't as absolute as you'd think, at least in the firms I've seen here in the US. Nearly all have shifted to cloud solutions for some documents at least in the litigation world where I dwell, especially in doc production and discovery. In a recent class action, my team was sent opposing counsel's link to the Box folder with their 4gb+ docs sent over from their client. Which shows that the clients are demanding that their outside counsel use some of the tools that they've embraced.

You're right with respect to internal memos, notes, drafts of pleadings, etc. But I suspect this is changing too as more lawyers want to be able to work on docs from their phones and iPads and remote laptops.