> I never supposed that Dropbox was secure, but lots of people did.
> 
> Doing it myself using Duplicity looks like it might be promising. It
> seems to be written in Python and to be pretty flexible. It will
> backup to Amazon S3 and I might even be able to persuade Mike to
> provide a suitable service for the back end.
> 
> On the other hand, it does look like it's trying to glue a lot of
> things together. Rsync, GnuPG, FTP, WebDAV. Really, FTP? And what the
> heck is HSI in this context? I can imagine something pretty
> Frankenstein-y coming out of all that. And can it possibly be
> efficient?
> 
> In any case, I'd be glad to hear people's opinions.

I'm using it regularly, encrypting backups to offsite storage locations.  It works wonderfully.

I've used S3 and WebDAV.  It does rsync like backups so that you're only sending differences across the wire, and if you are using encryption, it will encrypt all of that before it sends it over.  Pretty slick.

The newer version has the ability to flag stuff being sent to Amazon S3 as reduced redundancy storage, so you can pay the cheap price if so desired.

In short, I like it.  The only thing I don't like is that you still have to do regular full backups (rather than constant incrementals like you can do with straight rsync), so if you're being billed on bandwidth (like with Amazon), that can bite you.

Kris