From Dillobits Software:
InSync (64-bit) is a directory synchronizer that allows you to rapidly make identical copies of directory structures and all files within. InSync (64-bit) is useful in performing backups and propagating data from one machine to another. With InSync (64-bit) you can define and run multiple jobs that can specify one or more source directories, each which can be synchronized to one or more target directories. One-way, two-way, and backup synchronization modes are supported.