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File synchronization is aimed to make copies of files in two folders identical.
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.
We talk about two-way synchronization, when one folder contains the newest version of one file and a second folder contains the last version of another file. Both folders are the source and destination. You should take into account that two-way synchronization in Get Backup is two one-way synchronizations preformed one after another. Since that, if it makes difference for you which of the folders will be the source first, run one-way synchronization in one direction and then in the opposite one.
In the Synchronization Settings, you can allow to delete files and folders in the destination by deactivating the Never delete anything option. Nevertheless, 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.
The synchronization tool also has an option to consider the file modification date.