NOTIFICATION SERVICE
Ntfy
Version: 1.6.1 Web: https://github.com/ binwiederhier/ntfy
This author used to have a custom-made backup system that would update an extra copy of the $HOME directory on an external drive each night. That was a simple combo of Cron and a custom-tailoured Bash script, which contained the notification solution: the script collected all details in a log and then sent it via Postfix to a Gmail account.