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Re:Ask HN: Is there a good, zero-knowledge backup and synchr... by wladimir on Friday April 08, 2011 @09:01AM (#2423541)
I use Duplicity for remote incremental encrypted backups.

http://duplicity.nongnu.org/

It fulfills the "zero-knowledge" and reliable criteria. It's based on rsync. I'm not sure whether you can use it for synchronisation, though, never tried that.

Re:Ask HN: Is there a good, zero-knowledge backup and synchr... by StavrosK on Friday April 08, 2011 @09:03AM (#2423547)
I use duplicity+S3 as well for backups, it's the best for that. Hmm, I might sync everything to my home NAS and back it up to S3 with duplicity, now that you mentioned it, it might actually be cheaper.

Thanks!