rsync vm to external drive while working on it

#!/bin/sh

while(true)
do
    find '/Users/ossiemoore/Documents/Virtual Machines/clients/phillips66/' -type d -name 'caches' -exec rm -rf {} \;
    find '/Users/ossiemoore/Documents/Virtual Machines/clients/phillips66/' -type d -name 'appListCache' -exec rm -rf {} \;
    find '/Users/ossiemoore/Documents/Virtual Machines/clients/phillips66/' -type d -name 'appListCaches' -exec rm -rf {} \;
    rsync -r -av --delete '/Users/ossiemoore/Documents/Virtual Machines/clients/phillips66' '/Volumes/WINDOWS/VirtualMachines/'
    echo "[`date`] sleeping 10 minutes..."
    sleep 600
done