From Allway Sync:
Allway Sync 'n' Go keep track of recent changes in your files. This utility searches for the latest versions of your files in the specified folders, and copies the modified file to the counterpart folder. For example, it synchronizes your folders. Unlike other directory synchronization software that just copies file with the most recent file modification time, Allway Sync 'n' Go implements a sophisticated algorithm which does not depend on system clock accuracy, and also propagates file and folder deletions properly. If your computers are not connected by a network, use a removable drive to synchronize them. This edition of Allway Sync to install on USB stick or external HDD.
What's new in this version:
Version 12.15.1 has improved Google Drive support and updated language files.