Why daily level summarizing is the biggest unit on NPM polling settings? (next step is to delete all data) I want to keep history for 5 years, but DB will grow to extreme size during that time, with settings I have now. In yearly level or shorter, daily basis is ok, but I'm not probably interested in daily level traffic of all 500 nodes after 3 years, for example. Weekly or even monthly would be specific enough. All I want to see is bigger scale trends to help to predict and plan the network device and backbone upgrades etc. My settings are now 7 days, 30 days and 1830 days.