I've used htop to list the processes.
I've changed the metric retention settings as follows:
Data: Double, Counter Raw data 1 Minutes One minute data 6 Hours Five minutes data 10 Days One hour data 90 Days Six hours data 1 Years Twelve hours data 5 Years One day data 10 Years Others Binary data 180 Days GPS data 180 Days
I've got 4 nodes with 3 sensor values each (humidity, temperature, battery voltage) which send every 5 minutes to a MQTT gateway.
I've got no binary data.
The oldest data are three weeks old, the backup file is about 140kb.
I'm using the follwing java version as descirbed in this tutorial:
VM vendor Oracle Corporation VM name Java HotSpot(TM) Client VM VM version 1.8.0_151-b12 Java home /opt/jdk1.8.0_151/jre