FreeFileSync Forum

I found the error. I was using Windows task scheduler to start RealTimeSync after logging in, but that seemed to open two instances of RealTimeSync causing this error. Solved it by disabling one of the tasks in Windows Task Manger -> Startup.

I'm using FreeFileSync and RealTimeSync to backup my Time Capsule, that I have mapped as network drive, to an external hard drive that I have connect to my Windows 10 PC. Syncing with FreeFileSync seems to work fine, however when using RealTimeSync I get "Error Code 56: The network BIOS command ...