FreeFileSync Forum

A week ago and a moment ago I made a backup with "FFS 1.14" on the NAS (Samba share) and there were no "CopyFileEx" errors. I don't know what happened but "FFS" fixed itself or one of the Windows updates changed something.

The program said that version 1.15 is now available. Due to the fact that ...

I reinstalled FreeFileSync 1.14 and have just backed up to the NAS. Unfortunately (or fortunately :)) no file error occurred.

Processed items: 52 (314 MB)

In a week I can make another try.

I will try to do tests this weekend.

Does it matter for testing whether "FFS 11.14" is standard or "Donation_Edition"?

but am happy to try 11.15 beta if you are looking for further testing. Or I'll just update to 11.15 when it is officially released and see if that solves the issue.


When you encounter such a reproducible case again, a test with version 2, and if it fails, version 1 (in that order) would help ...

Next week with backup and no NAS synchronize problems. For me issue is fixed in FreeFileSync Beta 11.15 2021-10-11


Sounds promising! I can't release the code in the beta in the current form. First need to find out, which setting did the trick:

Are you able to reproduce ERROR_FILE_EXISTS ...

Next week with backup and no NAS synchronize problems. For me issue is fixed in FreeFileSync Beta 11.15 2021-10-11


Sounds promising! I can't release the code in the beta in the current form. First need to find out, which setting did the trick:

Are you able to reproduce ERROR_FILE_EXISTS that ...

Question 2 is: if zero-byte files are indeed left behind each time, why is FFS getting ERROR_FILE_NOT_FOUND? Maybe it's a buffering issue? The following version tries to disable buffering and get an accurate estimate whether the 0-byte target files exists or not:
https://www.mediafire.com/file ...

Question 2 is: if zero-byte files are indeed left behind each time, why is FFS getting ERROR_FILE_NOT_FOUND? Maybe it's a buffering issue? The following version tries to disable buffering and get an accurate estimate whether the 0-byte target files exists or not:
https://www.mediafire.com/file ...

I still have errors of this type (for 17 different files):

Hi Zenju!
Unfortunately "FreeFileSync 11.15 Beta" does not solve the problem. I temporarily deal with copying bugs from FreeFileSync. I paste the messages into Excel, where I transform them into commands for the BATCH script. So far, this is a working alternative.

I have the same problem with my NAS drive. The error "ERROR_FILE_EXISTS: The file exists. [CopyFileEx]" makes it very difficult to sync data. From what I read, there is little chance that FreeFileSync will handle it. Is it possible for FreeFileSync to create a BATCH file in such a situation, which ...