Run additional instances of redirect offsite. Replicate current mirrors.yaml from stuff. Healthcheck can failover DNS in an outage scenario.
Deploy Second copy of Armbian-redirect-dl and armbian-redirect-apt on a host supporting ipv4 and ipv6. have a job that replicates the mirrors.yaml files.
Write a script that can toggle DNS between primary and backup hosts leveraging this tool. (our DNS Is godaddy)
I also recommend switching dl, apt, archive, and eventually beta to CNAMES for redirect.armbian.com so that we can easily redirect.
once this is documented, easy to use, and reliable, we can drive via health checks