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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 do not trust the cloud, there are managed self-hosting options where you can host your nextcloud physically at home, like using nextcloudpi, HomeDrive or Syncloud, where you only need to trust their software update to keep the system secure and to not plant a back door Some are also open source, so in theory you can even audit and build the software by yourself. In the worst case, when you feel that your data is in danger, you have the option to physically unplug your data off the network. For this kind of self-hosting at your own place, remember to at least properly get a valid TLS/HTTPS certificate.