Standby/Failover

[akeck]

Describe the feature

Since I suffered the second hardware failure, I'd love to have a little redudancy in HA.
Having e.g. a second RaspberryPi that gets synced to the main one and when a heartbeat isn't received, it takes over.
Not on on OS level, but on HA level. Sync the database, updates and so on.
A second RasPi is affordable and a happy family is priceless.
Also an alert to the administrator would be nice when one device fails.
Ofc it would make sense to get an alert, when the standby device fails.

Use cases

Having a second chance in case of a hardware failure

Current workarounds

there is none. If one device fails, not only that you loose data, it takes several hours if e.g. InfluxDB, Zigbee2MQTT or Grafana is installed to restore a backup.

Anything else?

When using SD cards, a little redundancy would be great, but even SSDs don't live forever.