@erutan the hashing/Dropbox story is related to our discussion on encryption keys. The @techcrunch explanation is pretty clear. http://techcrunch.com/2014/03/30/how-dropbox-knows-when-youre-sharing-copyrighted-stuff-without-actually-looking-at-your-stuff
@erutan yes, I think the big difference between Spideroak and Backblaze (and other online backup solutions) is who holds the encryption keys. In the case of Spideroak, the encryption keys are mine and there is no way for employees or the govt to access.
Unlimited backup for $125/yr with the zero knowledge company Spideroak. Just don't lose your password. https://spideroak.com/blog/20140327085145-spideroak-offers-unlimited-storage-honor-world-backup-day