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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.
https://tailscale.com/ is one such solution. See https://tailscale.com/kb/1084/sharing/
I don't know what NAS that is. It's harder to give suggestions. Many of them can handle plugins for expressly situations like this. TrueNAS has, among other solutions, https://syncthing.net/
NOTE:
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Hence, a higher number means a more popular project.