Script to backup specified directories to a compressed .tar.gz and upload to AWS S3

backup-files.sh

#!/bin/bash

bucket="milkyway-backups"
server="MILKYWAY"
subject="FILES"
locationstocompress=( "/home" "/var/www" "/etc/apache2" )

masterfile="$server-$subject-$(date +"%Y-%m-%d").tar.gz"
tmpdir="/tmp/backup-$(echo $RANDOM % 999999 + 1 | bc)"
masterfile="/tmp/$masterfile"

mkdir "$tmpdir"
for location in "${locationstocompress[@]}"; do
        echo "Compressing $location"
        locationfile="$tmpdir/$(echo "$location" | tr / - | cut -c 2-).tar.gz"
        tar -cI pigz -f "$locationfile" -C "$location" .
done

echo "Compressing to master file $masterfile"
tar -cI pigz -f "$masterfile" -C "$tmpdir" .
rm -r "$tmpdir"

echo "Uploading to S3"
aws s3 cp "$masterfile" "s3://$bucket/$server/$subject/" --storage-class STANDARD_IA

echo "Deleting master file"
rm "$masterfile"