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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.
The EX2 does offer a number of built-in apps, though not NextCloud. It is possible with a little effort to install some Apps, for example I have SyncThing running well. This GitHub page has a NextCloud instance you could take a look at (this is where I got SyncThing from). Hope it helps.
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