Ask HN: Best Post-NSA debacle Dropbox Alternative?
BitTorrent Sync? Other options?
Edit: Their FAQ (http://www.jottacloud.com/faq/) says data is stored in Norway. Which AFAIK is better than the US in terms of privacy.
I am not sure if there are any big Dropbox competitors operating from outside the US (if NSA is your concern). There should be but I am not aware of any.
If you want client side encryption with close to dropbox functionality use spideroak, if you want snapshot/dedupped/backup + encryption use tarsnap.
Spideroak's functionality seems closer to Dropbox. Spideroak does seem more practical to use.
It supports strong encryption.
What that isn't giving me yet is Dropbox style iOS integration. (though there's a promising looking BoxCryptor iOS app,mi haven't made time to test it yet)