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File synchronization is aimed to keep up-to-date copies of files in several locations.
File synchronization can be one-way or two-way. When you mirror files from one location in another, it is called one-way synchronization. This happens when you copy new versions of files to a backup archive. Your working folder is the source and the backup folder is the destination.
If one folder contains the newest version of one file and the second folder contains the last version of another file, this is a two-way synchronization. Both folders are the source and destination.
Files in the destination folder can be replaced or deleted depending on the synchronization settings and the existence of newer versions of files. Files that have the Locked property activated, cannot be removed or replaced. To verify this property, right-click on a file in Finder and choose Get Info.