When DropSync performs a sync it updates the files at the destination if they have changed at the source. If a file has been deleted at the source, the default setting is not to delete that file at the destination. Although this setting is advised when using DropSync as a backup tool, it is not desirable if the goal is to mirror data between locations.
To enable propagation of file deletions (global setting);
Enabling file deletions (above) should cause two additional columns to appear in list of synced items in the main DropSync window
Enabling deletion for individual synced items;
Note that deletion only takes place during a sync in the appropriate direction. When using the deletion option take care to inspect previews to avoid accidentally deleting items