Limit xtrabackup bandwidth when taking full backup

Hi, how can I limit transfer to s3 on daily full backups? I saw the parameter should be --throttle 1 for 10Mb transfer, but I’m not sure where should I configure it?
I could only find instructions to enable compression:

  image: percona/percona-xtradb-cluster:8.0.19-10.1
  configuration: |

Is this the place to add throttle=1? Also I was wondering if enabling compression would increase CPU usage on SST trasfrers?

Thank you