Using Rsync to keep local and external drives synchronized

sync-external-drive.sh

#!/bin/bash

baseDir=~/Dropbox
externalDriveDir=/Volumes/Expansion

declare -a localDirs=("Documents" "Music" "Photos" "Shared" "Videos")

for dir in "${localDirs[@]}"
do
   echo "======================= Synchronizing ${dir} ======================="
   rsync -Pranuv --exclude ".DS_Store" $baseDir/$dir/ $externalDriveDir/$dir
done

date > $externalDriveDir/last_sync.txt
echo "======================= Done Synchronizing! ======================="

Change "Pranuv" to "Prauv" above in the rsync command (removing the "n") to actually make changes. The "n" means "DRY RUN"