SUMMARY It seems krusader can only synchronize the folders and files within the main folder left and right. But e.g. often I only need some selected / marked folders and files to compare and synchronize on 2 disks respectively in the 2 main folders. This is a very important functionality. You may have a look at the functionality of Total Commander based on the ancient Norton Commander. Total commander technically is working high professional for synchronization. STEPS TO REPRODUCE 1. 2. 3. OBSERVED RESULT EXPECTED RESULT SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION