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Re:Bup: Efficient file backup system based on the git packfi... by gcr on Sunday February 16, 2014 @10:21AM (#7247831)
Obnam is also great: http://liw.fi/obnam/

This does deduplication, but can also encrypt the deduplicated blocks and store them on (say) S3.

Re:Bup: Efficient file backup system based on the git packfi... by luxpir on Monday February 17, 2014 @04:09AM (#7251210)
Obnam can also push/pull backups over SSH/SFTP. Seconded.