Hi,
The backup nds file is in /NDS_Backup folder.
If there is no backup file in the folder, you should edit a file.
There is an ini file for NDS Backup tool 3in1, like NDS_Backup_ tool_ 3in1.ini.
Open the file and change the 'SaveFile' value, 0 to 256 and save the file.
Then try whole...