Qtd Sync is described as 'A graphical interface for the Rsync engine that will synchronise files between two computers either locally or over the internet. The beauty of Rsync is that it only transfers the exact part of a file that has changed (differential synchronisation), saving bandwidth and time' and is an app in the backup & sync category. There are more than 100 alternatives to Qtd Sync for a variety of platforms, including Windows, Mac, Android, Linux and iPhone apps. The best Qtd Sync alternative is Dropbox, which is free. Other great apps like Qtd Sync are FreeFileSync, Microsoft OneDrive, Duplicati and rsync.