Limit/reduce write speed with local backups

I am using rclone with cron (inside Docker) for local synching of two hard drives connected via USB at a Rock64 board.

The cooling of the Rock64 is not very good and the temperature goes straight up, when running rclone.
How can I reduce the write speed?

I have read about --bwlimit, does this option have any effect with local mounted drives or is this only for limiting upload speed to cloud based services?
For example --bwlimit=50M would write files at 6,25MB/s speed?

It works with local drives too, and note that the parameter is MBytes/s so --bwlimit 10M is 10 Mbytes/s

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Ah thanks for the clarification, I thought M was for Mbit

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