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I took your script as an example and created a version which also encrypts the backups using GPG.

You can find the script here:
https://codeberg.org/SWEETGOOD/andersgood-opnsense-scripts/src/branch/main/backup-opnsense-via-api.sh

I also wrote a short blogpost in German with some explanations:
https://andersgood.de/kurz-notiert/opnsense-per-api-verschluesseltes-backup-der-konfiguration-anlegen

Thanks to the TS for your work!

Nice script, a minor improvement would be to change the date command output to include hour and minute. This makes it possible to run the backup multiple times a day.

$(date +%Y-%m-%d-%H:%M)

Also, at the end the clean up is a bit dangerous. If you by accident put the backup files in your home or in / the outcome is terrible ;)