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This feature allows multiple repositories to share deduplication-relevant secrets (id_key and chunk_seed) while maintaining secure, independent encryption keys. `borg key export-related-secrets <REPO> <SPATH>` to export the secrets to a JSON file. `borg init --import-related-secrets <SPATH> <REPO>` to initialize a new repository using the secrets from the JSON file. Both repositories must use the same chunk id algorithm (both HMAC-SHA256 or both BLAKE2b). If you create related repositories with borg 1.4.x, you can later transfer their archives to one or multiple related new borg2 repositories without breaking deduplication. But please note that we might remove BLAKE2b support for new borg2 repos, see #8867, so this might only work for HMAC-SHA256 in the end.
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.. include:: key_export-related-secrets.rst.inc
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