Sync two external hard drives with rclone

To sync:

$ rclone sync /path/to/src/drive /path/to/dst/drive --progress --fast-list --transfers 38 --buffer-size 1G --use-mmap --local-no-set-modtime --ignore-checksum --human-readable --order-by size,mixed,90

To check afterwards:

$ rclone check /path/to/src/drive /path/to/dst/drive --differ ~/r-differ.txt --error ~/r-error.txt --missing-on-dst ~/r-missing-on-dst.txt --missing-on-src ~/r-missing-on-src.txt --progress --checkers 38 --fast-list --size-only