Create a FreeFileSync batch file using "Silent mode".
Set error handling to "Exit instantly" or "Ignore errors" to avoid having a pop-up stop the program flow. In case errors occur FreeFileSync will exit with a return code < 0 that can be checked via the ERRORLEVEL batch command.
Create a *.cmd or *.bat file to specify the location of FreeFileSync.exe and pass the name of the FreeFileSync batch file as first argument; e.g.:
"C:\Program
Files\FreeFileSync\FreeFileSync.exe"
"C:\SyncJob.ffs_batch"
@if not errorlevel 0
(
echo An error occured!
pause
)
Instead of displaying "An error occurred!" you can specify any other command like sending an email notification (using a third party tool).