Quick and dirty backup script for a DD-WRT router with Twilio SMS notifications if it fails

dd-wrt-router-backup.sh

#!/bin/bash

# Config variables supplied by the user
TWILIO_ACCOUNT_SID=""
TWILIO_AUTH_TOKEN=""
TWILIO_NUMBER=""
TO_NUMBER=""
LOCAL_BACKUP_PATH="/path/to/router-backups"
ROUTER_HOSTNAME="192.168.1.1"

SSH_HOST="root@${ROUTER_HOSTNAME}"
SSH_OPTIONS="-q $SSH_HOST"

send_sms() {
        curl -X POST \
                -d "Body=$1" \
                -d "From=$TWILIO_NUMBER" \
                -d "To=$TO_NUMBER" \
                "https://api.twilio.com/2010-04-01/Accounts/$TWILIO_ACCOUNT_SID/Messages" \
                -u "$TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN"
}

write_syslog() {
        logger -t router-backup -p user.error $1
}

(
        set -e

        BACKUP_DIR="/tmp/root"
        BACKUP_FILE_PATH="${BACKUP_DIR}/nvrambak_$(date -I).bin"

        write_syslog "Deleting $BACKUP_FILE_PATH on router"
        ssh $SSH_OPTIONS "rm -f $BACKUP_FILE_PATH"

        write_syslog "Backup up router to $BACKUP_FILE_PATH"
        ssh $SSH_OPTIONS "nvram backup $BACKUP_FILE_PATH"

        write_syslog "Downloading router:${BACKUP_FILE_PATH} to ${LOCAL_BACKUP_PATH}"
        scp ${SSH_OPTIONS}:${BACKUP_FILE_PATH} ${LOCAL_BACKUP_PATH}
) || {
        write_syslog "Failed to create router backup"
        send_sms 'Your router backup stopped working. Go fix it'

        exit 1
}