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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If you want to lab up a hardened repository, go with Ubuntu as the distro of choice and leverage this script that basically does everything for you and you'll be able to mess around with it without having to bang your head against the wall setting it up manually when you're getting your feet wet. Admittedly, it's not THAT difficult, but even someone who works at Veeam I managed to miss one small step when I was following along in the User Guide and made me spend way more time than I'd like to admit trying to figure out what was wrong.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.