It can also do a quick hash check of files on the source and destination to determine whether or not it needs to transfer a new copy, possibly saving significant time and bandwidth. To accomplish this efficiently, by default, it will check the modification times of files. Also, rsync provides the ability to synchronize a directory structure (or even a single file) with another destination, local or remote. It checks to see if files exist in the destination before sending them, saving bandwidth and time for everything it skips. The rsync tool can recursively navigate a directory structure and update a second location with any new/changed/removed files. One of the most useful tools in a sysadmin’s belt for this kind of task is rsync. Admins (or normal users) often need to back up files or keep them in sync between multiple places (including local and remote) without transferring and overwrite all files on the target every time.
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