crontab demo

crontab -e

*/30 * * * * /USER/bin/example.sh >/dev/null 2>&1

example.sh

#!/bin/bash

# directories
MY_DIR=/USER/NEW

# paths
RCLONE=/USER/bin/rclone
RCLONE_CONFIG=/USER/config/rclone.conf

# used to detect running commands
function ppgrep() { pgrep "$1" | xargs --no-run-if-empty ps fp; }

# copy some data
function copy_data() { $RCLONE --config $RCLONE_CONFIG copy "$MY_DIR" my-remote: > /dev/null 2>&1; }

# make sure the command is not running
if [[ ! -n $(ppgrep "rclone" | grep -e "copy $MY_DIR") ]]; then
   # run it
   copy_data
fi

This will try to run an rclone copy every 30 minutes. If a copy is still in progress, it will skip and try again in 30 minutes.