Sync two rclone remotes, cycling through a set of service accounts at 500GB each. Assumptions here are: you have 100 service accounts. Their JSON credential files are named `sa-1.json` through `sa-100.json` and are stored in `/opt/sa-json`.

sa-batch-syncer.sh

#!/bin/bash
COUNTER=1
SOURCE="remote:path"
DESTINATION="remote:path"
JSON_LOC="/opt/sa-json"
while [ $COUNTER -lt 100 ]; do
  echo Using service account sa-$COUNTER
  /usr/bin/rclone sync -v --delete-excluded \
  --fast-list --checkers=32 --transfers=16 --max-transfer 500G \
  --stats 5s --drive-service-account-file=$JSON_LOC/sa-$COUNTER.json \
  --log-file=sync.log --drive-chunk-size 64M \
  $SOURCE $DESTINATION
  let COUNTER=COUNTER+1
done