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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.
My recommendation, based on tools I use, would be: 1.) make a folder just for your backed up saves; 2.) move the save files to that folder; 3.) symlink the save folder back to where it's originally at; 4.) Use Resilio or SyncThing (or Google Drive or OneDrive, if you want to use the cloud) to back up the save folder across your devices.
The tool that people often recommend is Ludusavi. I don't know how they play with VN's very random location of saves, though, and even then I mostly use it on Linux where it's easy (if fairly space inefficient) to backup an entire wineprefix/steamcompat folder.