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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.
I am the author of another option: syncrclone. I am, of course, biased but I think it actually works better than bisync, has a more robust algorithm, and is more compatible (including with WebDAV remotes). I wrote a good-faith comparison here. It is also more advanced to use including knowing that if you use webdav, you must set compare = 'size' (but hey, now you know!).
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.