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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.
Would a mention of my open source backup system, Snebu (or https://github.com/derekp7/snebu) fit in this thread? Elevator pitch -- GPLv3 C code, snapshot-based, compresses, encrypts, deduplicates, can back up clients without installing an agent (just need ssh, bash, tar, and find commands on client for "pull" backups), push backups can have restricted permissions (i.e., give a client permission to push backups only, but not delete backups, or give a user restore-only permissions). Uses tar to collect the data, stores metadata in an SQLite DB on the server, files are stored in LZO format (can be read directly with lzop) (unless client-side encryption is used, but the data can still be decrypted with openssl then decompressed with lzop). Encryption is public-key based instead of needing to keep a shared symmetric key or passphrase laying around on your backup server.