rsync

fast, versatile, remote (and local) file-copying tool
rsync is a fast and versatile file-copying tool which can copy locally
and to/from a remote host. It offers many options to control its behaviour,
and its remote-update protocol can minimize network traffic to make
transferring updates between machines fast and efficient.
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It is widely used for backups and mirroring and as an improved copy
command for everyday use.
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This package provides both the rsync command line tool and optional
daemon functionality.