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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 local storage, password safe (https://pwsafe.org/) is good and was designed by Bruce Schneier.
Not natively, no. I use SyncThing to sync mine between multiple devices, though. It's a direct-sync process so the dbx file never actually needs to reside on a 3rd party platform (eg. cloud storage). There are desktop, mobile, and even docker versions for hosting on a NAS. That may or may not meet the 3-2-1 backup rule depending on where you're opting to store at least one of the copies.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.