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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 timed snapshots you can checkout my btrfs snapshot manager yabsm. I just released version 2.5.5 today! Yabsm lets you take snapshots and perform both local and remote backups on 5minute, hourly, daily, weekly, and monthly timeframes. It also comes with a simple query language for locating your snapshots and backups.
There is also btrbk which can do a lot of the same things as yabsm but I created yabsm particularly because I found btrbk confusing, but you should definitely check it out.
NOTE:
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Hence, a higher number means a more popular project.