On Fri, Apr 7, 2017 at 10:18 AM, Simon Slavin <slav...@bigfraud.org> wrote:

> Dropbox copies an entire file every time a part of it is updated.


Dropbox claims that it performs difference determination, even on binary
files.

Of course, that would not reduce the other problems listed in this thread
(atomicity, etc.)

From:   https://www.dropbox.com/en/help/8


*Before transferring a file, we compare the new file to the previous
version and only send the piece of the file that changed. This is called a
"binary diff" and works on any file type. Dropbox compresses files (without
any loss of data or quality) before transferring them as well. This way,
you also never have to worry about Dropbox re-uploading a file or wasting
bandwidth.*

Donald G.
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