Local automation without the cloud is important not because of principle, but because of water, light and time. If the Internet is lost, the plants are still in the box or greenhouse. The pump should not freeze, the leak should not wait for the server, and the lights should not turn off for a day just because the external service is unavailable.
The cloud is useful for remote access, reporting and notifications. But it is better to perform basic maintenance actions locally: on the GrowerHub, Home Assistant, Zigbee2MQTT, ESPHome controller or another node near the equipment.
What to keep locally
Pump stop, watering duration limit, pause between starts, reaction to leakage, light schedule, basic ventilation, service mode and checking data freshness should work locally. If these functions depend only on the cloud, the system becomes vulnerable to network failures.
For automatic watering, failure logic is especially important. If the humidity sensor is unavailable, it is safer to stop the automatic run and send a notification when communication is restored rather than water at the old value.
Where the cloud helps
The cloud is convenient for viewing charts from your phone, collaborating, storing long history, cycle reports and push notifications. These functions can catch up later if the connection is lost. The main thing is that the local system records events and transmits them after the Internet is restored.
GrowerHub can combine both approaches: local security rules and a cloud layer for interface, reporting and team collaboration. A more general choice is discussed in the article local controller or cloud service.
Home Assistant and MQTT
Home Assistant, MQTT and Zigbee2MQTT often become the local basis of a DIY system. They allow you to read sensors and perform automation within the network. But locality does not negate accuracy: you need backups, clear topics, availability, a log, and protection from conflicting rules.
If GrowerHub is linked to Home Assistant, it is important to decide who controls the pump and where the events are stored. The article Home Assistant for plants helps break down this architecture.
Checking autonomy
Don't assume the system is local until you've checked. Disconnect the Internet, leaving power and local network. See if the schedules, rules, leak stops, and light schedules are working. Then return the Internet and check the synchronization of events. It is better to do such a test before the real absence of the owner.
Conclusion
Local automation is needed where delay is dangerous: watering, leakage, light, ventilation and service mode. Let the cloud be responsible for convenience, reporting and remote access. For GrowerHub this is a practical model: plants are protected locally, and the user receives a full interface and history.