Evocon devices have internal flash storage where the device saves signal data events when the device is offline. Once the device is online, it will validate these events and send them to the cloud servers.

In short, the device can store data for at least 5 days if all 3 inputs are detecting signals every minute of the day. If only 1 input is used, the device can store at least 2 weeks worth of data.

That being said, the device can keep time of the signals only during very short (under 5 seconds) restarts. If power is lost for more than 5 seconds, internal clock will reset and if the device does not have access to Evocon time server or NTP, it will not have the correct time.

The device will then save timestamps of the events with "since restart" timestamps. If the device is able to receive correct time, it will retroactively fix the timestamps of the signal events in memory. If there are subsequent restarts, timestamps of the events between the first and last restart are unknown (because the device does not know for how long it was offline) and therefore this data is discarded.