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snapraid
A backup program for disk arrays. It stores parity information of your data and it recovers from up to six disk failures
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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.
With two drives? Just run them as-is. Once you get a third disk, set up https://www.snapraid.it. Then as you add more, just follow https://www.snapraid.it/faq#howmanypar to have the correct number of parity disks. Or don't, Plex content is probably easy to re-acquire if you need to so having redundancy or a backup isn't all that important.
NOTE:
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Hence, a higher number means a more popular project.