rsync
Open Sourcersync is a versatile command-line utility designed for efficient file transfer and synchronization. It specializes in incremental transfers, copying only the parts of files that have changed since the last synchronization, making it highly efficient for backups and mirroring.
Key Features
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Highly efficient incremental transfers using the delta-transfer algorithm.
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Preserves a wide range of file attributes (permissions, timestamps, etc.).
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Extensive command-line options for fine-grained control.