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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.
For backups you can use Arq, and point it to whatever storage backend (local or cloud) that suits you. I use OneDrive since I already had a couple of TB of unused space there.
If you’re dead set on running local, I would suggest something like Resilio Sync or Syncthing, neither of which requires you to open up any firewall ports, greatly reducing the risk of intruders getting into your network.
Use something like Cryptomator to encrypt sensitive files before uploading them.
NOTE:
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Hence, a higher number means a more popular project.