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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.
As you wrote, Kopia is “unstable” (works for me, but YMMV), but if you want the functionality of Kopia in a stable package, I highly recommend Duplicacy. The CLI version is free, but I also highly recommend that you buy a license for it just for the the GUI. Duplicacy works in mysterious ways, at least if you’re used to more traditional backup methods, and the UI nearly abstracts that away.
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.