Maybe you'll be interested in https://github.com/restic/restic https://github.com/restic/restic. It does deduplication (with content defined chunking) and clien

Maybe you'll be interested in https://github.com/restic/restic https://github.com/restic/restic. It does deduplication (with content defined chunking) and client-side encryption, and is actively developed. It does also use its own pack format, but that's fully documented. I'm currently using it for backing up about 1.5TB and it's working very well.