FreeFileSync Forum

Something similar happens to me but with only a few GB of various files to sync.
Me too I'm on Windows 10 64 bit.
The problem goes away deactivating Windows Defender just for the time needed to sync.


Thanks! I'll try it next time. Plus, it was my first time to run the sync so there is no ...

FreeFileSync freezes after 6 hours of synchronizing 600+ GB files. I have to terminate the process finally. Is there a way to backing up such amount of files? No big files, but gigantic amount of small ones, probably millions. Operating on Windows 10 64 bits. Thanks in advance!

I have been synchronizing a local folder with a folder in the virtual hard disk created by Google Drive Windows 10 client. However, FreeFileSync keeps complaining about "Error code 1" and "[CopyFileEx]", and then terminate synchronization. In the log, the files resulting in such problem usually have ...