on 18.12.2014 we've got a black out an all server works on the UPS, so and i know it has 19minutes left for autonomy time, i also i create a screenshot from 19minutes, but when i look now to zabbix i see only a minimum of 29minuten, i have no backup from this time so i can't look into the database/values i think therer went somthing wrong with the zabbix-create-trend-process.