[derefr]

This service doesn't really seem like it needs anything in particular to scale; it's just a static asset-load of Javascript. All the "magic" is done by talking to the same iCloud backend that the installable version of iWork does, which was already scaled to the point where this would just be a blip.

[ryanglasgow]

I'm referring to file storage and syncing across devices. It's not particularly easy given that Dropbox is an entire company devoted to this cause.