[wanderfowl]

I liked SpiderOak a lot for its security, but sadly, it was never very reliable as a backup or sync service. I spent more time troubleshooting and rebuilding databases and clearing serverside caches and so forth in 8 months there than I have in almost 5 years of other services. And because of that, I never really felt like I could trust it as a backup.

Also, realize that SO is a poor substitute for Dropbox, as it's only really a backup service. Although it includes a sync option which works passably, the moment you access your files from a mobile device, you upload your keys to the server, and zero-knowledge goes poof. And even if you're willing to give that up, I've never met a mobile app which allowed you to access and manipulate files in the ways Dropbox does. You can do some basic "share just this file" stuff, but it's a very different product.

I really hope that was just because I was on it when they were growing massively due to the NSA leaks, but sadly, for me, they were a textbook example of "Great idea, bad execution".