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doublecmd
Double Commander is a free cross platform open source file manager with two panels side by side.
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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 backing up files it might be worth using a different file management interface such as Double Commander(free) but is not particularly fast, MultiCommander or My Commander (free) which is supposed to be very fast.
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.