Couple of options. If you have a VPS you could install something like Nagios and do passive updates. Set a stale threshold and have the stale check report as a warning.

I have multiple wifi sensors that boot, perform their function, then go into deep sleep for a set time. I set up a passive service type that changes the status to unknown with the message “data acquisition failure” if the stale threshold is hit.

I don’t use cloud storage for backups, but any data I don’t want to change (pictures, music, etc.) on my NAS has par2 automatically created for them on the primary storage device. After that, both the original file and par2 files get backed up.