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lsyncd
Discontinued Lsyncd (Live Syncing Daemon) synchronizes local directories with remote targets [Moved to: https://github.com/lsyncd/lsyncd] (by axkibe)
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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.
Another vote for Syncthing. It will do the job without any problem. As an alternative, lsyncd can be used with rsync. https://github.com/axkibe/lsyncd I had a similar setup in past and it worked well with Syncthing, but I moved to the Nextcloud server at the end. It allowed me to store all the data on one server (thus decreasing the number of backup job to one, only this server needs to be backed up) and have clients synchronize the data they actually use (by using virtual files https://nextcloud.com/blog/nextcloud-desktop-client-3-2-with-status-feature-and-virtual-files-available-now/)