I recently created a "petition" for SpiderOak to open source the client (and allow people to build it themselves from source) so that people can let SpiderOak know their thoughts. The petition signatures are sent to SpiderOak.

It's still available at the link below if any SpiderOak user (or potential customer) wants to use it to "show the numbers" on a single site (as opposed to scattered comments): http://www.change.org/petitions/spideroak-http-www-spideroak...

There's an online backup service called Cyphertite (cyphertite.com) that provides the sources for its client programs on all the platforms it supports. So I don't really see why SpiderOak, with its prominent proclamations of "zero knowledge", cannot walk the talk.

Of course, I understand that certain competitive advantages may take longer to provide in the open (until factors other than the client source code and backend architecture become competitive advantages). But I have to admit that SpiderOak has been dragging on opening up the source.

Edit: Let me also admit that I do like SpiderOak and the emphasis it places on privacy and in educating users about privacy. We need more services that strongly support what ought to be basic rights.