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In v1.63 memory usage in the b2 backend was limited to `--transfers` * `--b2-chunk-size` However in v1.64 this was raised to `--transfers` * `--b2-chunk-size` * `--b2-upload-concurrency`. The default value for this was accidently set quite high at 16 which means by default rclone could use up to 6.4GB of memory! The new default sets a more reasonable (but still high) max memory of 1.6GB.