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zpaqfranz
Deduplicating archiver with encryption and paranoid-level tests. Swiss army knife for the serious backup and disaster recovery manager. Ransomware neutralizer. Win/Linux/Unix
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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.
ZPAQ1 is great, it supports incremental backups and compression algorithm is really good even on already compressed data like images. zpaqfranz2 is a fork that adds more advanced checksumming algorithms. It's also worth looking into.
Or use parchive to generate parity files, and preferably store these on a different drive or optical disc.
NOTE:
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Hence, a higher number means a more popular project.