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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.
Sound quality from a phone is most certainly going to suck, conversations are going to be barely intelligible when in your pocket, and battery life will be disappointing compared to a dedicated recorder. There certainly are phone applications that allow constant background audio recording, but none of them are perfect from what I'm aware of (Android really doesn't want you to run applications consistently without inconveniences, even disabling all optimizations). I think using a program like Echo [0], that constantly records in the background rolling over a certain user-defined amount of time/device memory and lets you save the past X minutes available when needed and user-controlled is more convenient (and I don't really see a lot of alternatives around from a brief look). In any case, you could sync the recordings of the application of your choice with synching instead of using a cloud solution. Best would be to find one that supports opus encoding for maximum size efficiency.
0. https://github.com/mafik/echo