I use a similar service (healthchecks.io) to alert me if my backup jobs haven't succeeded in the past 5 days.

* rsync photos from phone to NAS (via Termux and Wireguard)

* btrfs-send from desktop to NAS

* restic from NAS to Backblaze

The integration is simple (just a HTTP request) and it notifies me via ntfy.sh and email.