rsync backup to 2nd HD very slow

It's taking over 6 hours for the daily backup via rsync to my secondary drive. It normally takes less than 2 hours to copy about 80GB of data. The CPU usage is high and slowing down the server. How could I find out the reason why it's taking this long? Something's gotta be wrong. rsync backup to 2nd HD very slow

 

 

 

 

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