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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.
Syncthing - https://syncthing.net/
Before I explain my setup, realize a simple one-way, two-device setup can be done quickly and easily. https://docs.syncthing.net/intro/getting-started.html
I have it set up on my phone, desktop (Devuan), laptop (MX Linux), and a server (DietPi).
I have the DCIM picture folder synced one-way from the phone to the server, and one-way from the server to the desktop and laptop. As soon as a new picture is taken and a network is in range, the photo is synced.
I also have separate sync folders set up for other purposes: