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Re:S3QL: an S3 FS with encryption, de-dup, immutable trees a... by zimbatm on Tuesday September 01, 2015 @03:53AM (#10151208)
Camlistore can use S3 as a backend and does deduplication. Not sure about the encryption though.

[0]: https://camlistore.org/

Re:S3QL: an S3 FS with encryption, de-dup, immutable trees a... by darkr on Tuesday September 01, 2015 @07:30AM (#10151708)
It's supported encryption since last year or thereabouts. I really like the look of camlistore and have done a bit of playing around with it. Was considering deploying it a while back but the docs are [still] lacking and far as I can tell doesn't seem to have gotten to a production ready state yet.

Here's a gist showing how to configure an encrypted store on s3: https://gist.github.com/cknave/3ddae29cc466663cb40e