Interviewed by CNN on 18/11/2013 18:35, Rick Merrill told the world:

> I found it (DB) surprisingly fast (faster than ftp?). And I have the 
> impression
> that most of the files for news and mail are small.  I also thought that the 
> other 
> instance was marked in-progress until updated.

Dropbox uses a few tricks to speed up transfers, like checking if the
file you are uploading has been already uploaded by another user (if so,
then it sorta "lies" that it has uploaded the file, when in fact it
copies it from the other user).

As for mail files... not that small, no. The MBOX mail store system
Seamonkey uses makes a file for every mail/news folder on your profile.
Those can end up quite large, if you keep lots of messages (particularly
ones with large attachments) on the same folder. But average size will
depend on your usage. For instance, most of my mail files are under 10
Mb, but I have a few over 100 Mb -- one is almost 400 Mb.

OTOH, I have no idea how good is Dropbox at doing differential syncing.
If it can identify the parts that have changed and sync only those, then
it's likely to be a fairly fast sync -- mail store files tend to be
changed only at the tail-end, most of the time.

It's a pity that Mozilla still hasn't finished implementation of a
maildir-like mail store (one where each message is a distinct file).
Those systems tend to yield more efficient syncing and backups, since
olde message files are essentially static.

-- 
MCBastos

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