# Synchronization direction

Synchronizing two folders copies files between the source folders in both directions. This means that after a synchronization, both folders will contain the newest versions of all files.

When a synchronize document is run, the modification dates of items in the source folders are compared. Files and folders will be duplicated or replaced as necessary.

- older files will be replaced by newer files
- new files and folders will be copied to the other source

The basic backup function is simply a synchronization which is limited to a single direction. Files will only be copied in the direction you indicate.