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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.
In case you use third party tools, resync.py from here has a backup command that will pull pdf copies of all documents on the remarkable via cable. Usability might be limited though, as it is a command line tool, so maybe not necessarily what you are looking for.
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.