rsync to google cloud storage with gsutil in a short and simple bash script, which takes an array of local directories as the source

backup.sh

#!/usr/bin/env bash

bucket=name-of-your-bucket

dirs=(
~/relative/path
../relative/path2
/absolute/path/
/Volumes/Macintosh HD/full/absolute/path
)

for dir in ${dirs[@]}
 do
 path="$(cd "$(dirname "${dir}")"; pwd)/$(basename "${dir}")"
 # absolute path solution: https://stackoverflow.com/a/31605674/3700104
 echo ${path} && gsutil -m rsync -e -r -d "${path}" "gs://${bucket}${path}"
done