[JosephRedfern]

How would system-wide caching work unless the HTTP server dropbox requested the file from sent a checksum of the file being requested? Just because something has the same URL doesn't mean that it's the same file at the other end (http://wordpress.org/latest.tar.gz for instance)

[varenc]

It obey's HTTP caching controls. Checkout the end of the docs: https://www.dropbox.com/developers/dropins/saver

[JosephRedfern]

I see - but the typical dropbox deduplication methods wouldn't work here (at least not in terms of bandwidth usage), would they?