DigitalOcean dynamic DNS updater script for your subdomain

dnsupdater.sh

#!/bin/bash
# Created by fibergames.net // Loranth Moroz // v.0.5
# Required tools to run this script as is: curl (https://curl.haxx.se/) & jq (https://stedolan.github.io/jq/)
# This only works for Digitalocean - 10$ credit referral link: https://m.do.co/c/fed75101475f
# Edit token, domain, subdomain to fit your needs
# Substitute ipinfo.io with your own ip-checker e.g. ipecho.net/plain
# This is to be used with crontab -> example entry to run it every 3hours:
# 0 */3 * * * sh /path/to/script/dnsupdater.sh
# Don't forget to make it executable: chmod +x /path/to/script/dnsupdater.sh

token="DO-Developer API_KEY"
domain="Your domain hosted at DO-nameservers"
subdomain="PREPARED subdomain via DO-Interface"
ip=$(curl --silent ipinfo.io/ip)
record=$(curl --silent --request GET --header "Content-Type: application/json" --header "Authorization: Bearer $token" "https://api.digitalocean.com/v2/domains/$domain/records" | jq ".[] | . [] | select(.name==\"${subdomain}\")" 2>/dev/null)
record_data=$(echo "$record" | grep "data" | sed --regexp-extended "s/[^0-9\.]//g")
if [ "$ip" = "$record_data" ]; then
            echo -e "\n==No DNS update is necessary=="
    else
            record_id=$(echo "$record" | grep "id" | sed --regexp-extended "s/[^0-9]//g")
            curl --silent -X PUT -H "Content-Type: application/json" -H "Authorization: Bearer $token" -d '{"data":"'$ip'"}' "https://api.digitalocean.com/v2/domains/$domain/records/$record_id" > /dev/null;
            echo -e "\n==DNS updated with IP: $ip=="
fi

This is great. But would it be better to check if the IP address changed, by saving it as Previous, and if ip != Previous then use the api? This way you could check as often as you want, but only hit the api when it needs to update.