rsync has an option to set about the compression level --compress-level=NUM. The document of rsync doesn't say anything about how to choose NUM. I found something at this post ., which refers a comment from zlib.h: The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: 1 gives best speed, 9 gives best compression, 0 gives no compression at all (the input data is simply copied a block at a time). Z_DEFAULT_COMPRESSION requests a default compromise between speed and compression (currently equivalent to level 6).
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