Restoring from an automatic core backup from an update, is it as simple as I think?

[tom_l]

You don’t need to restore from a backup (see below). But yes that will replace your configuration and the core version.

The reason your automations disappeared is because you are using device triggers and actions. If any of those devices are unavailable your automations disappear until the devices return. Recover the devices and your automations will reappear. They are not gone, just unavailable.

If you want to stop this from happening then stop using device automations (highly recommended for other reasons too):

What happens if I have to replace a device

It’s a big problem that you can avoid by not using device triggers, conditions or actions. There are always other triggers conditions and actions you can use instead. e.g. instead of a device turn on trigger use a state trigger. If you only ever use entity_ids in your triggers, conditions and actions then when you have to replace the device you can change the new entity id to match the old one in one place and all your automations keep working. If you use device ids you have to change all of …