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da91858702
Raw format saves 12 bytes of header for gzip and 4 bytes of checksum for lz4 (plus CPU overhead). This may not seem like much, but over millions of small files or incremental blocks can really add up. Even though it may be a relatively small percentage of the overall backup size it is still objectively a large amount of data. Use raw format for protocol compression to exercise the feature. Raw compression format will be added to bundling and block incremental in a followup commit.