Bidirectional synchronization of folders or complete drives in Windows, from disk to disk, from pc to pc, either locally or via network. Data security for documents to be modifieded on several computers. Transportation of documents on external drives and usb flash drives File Synchronization, folder replication utility, mirroring files and folders. You often bring documents from your workplace to your home using a portable hard drive or a USB flash drive. You probably already overwrite your modified files and lost your work.