Is there any backup software similar to Arq[0] that uses Rackspace?
[0] Arq: http://www.haystacksoftware.com/arq/
[0] Arq: http://www.haystacksoftware.com/arq/
There is a very easy to use command line interace, and also a GUI (which I have not tried).
It doesn't even have to be something as 'cloudy' as rackspace, support for something like webdav as an ARQ backend would also be nice.
That being said, I have actually no idea about the codebase and user base, so this could be a completely wrong assumption :)
Personally, my biggest 'problem' with Arq at the moment is, that the iPhone client works, but I'm missing stupid small things like thumbnail previews for uploaded images.