Echo

The echo action will make copies of files that are new and changed on the left to the right. New and updated files are copied left to right. Renames and deletes on the left are repeated on the right.

For example, when you travel, you take a copy of your pictures, tunes, and documents to work on. When you return, you want SyncToy to notice the files you added, changed, deleted, and renamed in the left folder, and you want SyncToy to recreate those additions, changes, deletions, and renames in the right folder. Echo is very similar to Synchronize, except Echo works only left to right.

Echo is the SyncToy action to use.

Every file in the left folder that is new or changed is copied to the right folder.
Every file in the left folder that has been renamed is renamed in the right folder.
Every file that was deleted from the left folder is deleted in the right folder.
Note: SyncToy does not actually delete any files. It merely moves the files to the Recycle Bin.
No left folder files are deleted, or renamed.
No files are copied from right to left.
Right folder files are deleted.
Note: SyncToy does not delete folders.