Run-script-before-required Error: "system can´t find file"

Clicked “Advanced Option”: run-script-before-required wrote “backup.bat”
Expected Duplicati to run my “backup.bat” stored at C:\ on my Windows-PC
Got Error: “system can´t find file”
Where to store the backup.bat, to enable Duplicati to find the file?
Thanks al lot

Welcome to the forum!

Try putting the full path to your batch file in Duplicati. eg, C:\backup.bat

thank you for welcome
thanks C:\backup.bat worked for me!