One Way Synchronization
Step 1: Click on the big green arrow between folder selection panels.

Step 2: The all-way/one-way control dialog appears.

Step 3: To turn on one-way synchronization, click on the small round button for the source folder. To turn on all-way synchronization, click on the small round button next to the small two-way arrow.

Step 4: (optional) Use the checkboxes at the bottom to specify how deleted and modified files should be handled during synchronization. In one-way synchronization the Propagate deletions checkbox is cleared by default.

Finish: One-way synchronization is now turned on (or off).

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