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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.
If you just want to mirror everything, without using snapshots, then you can use rsync or even something like syncthing if you want it automatically running in the background. Then for deduplication you can either just periodically run a deduplication tool for btrfs. Or use something like https://github.com/Zygo/bees which will run in the background as a systemd service and deduplicate everything on a specific drive.
If you're looking for a way to restore your system configuration should your drive go kaput, perhaps look into declarative means of configuration instead. With those, your system is defined by a few text files and restoring or duplicating it is trivial. If you want to stay with Arch (great distro), imperative tools like Ansible, Puppet or Chef should work. If you want to try greener pastures, look into NixOS which is what I use. All I need to restore my machine is a few text files like this one (I just clone the git repo).