Hi,
you should consider 2 things.
1. The ndure softmod creates a shadowc drives and fills up the original c drive. That way, it becomes difficult for a game to update the dash and screw the softmod. So, it is possible that your backup is on the shadow drive and it is possible that it can't store the backup on the c drive (because it is full)
You can put it on a floppy if your pc still has a floppy drive.
2. Xboxhdm expects the eeprom.bin file to be in the e:\backup folder. You could put it in the eeprom folder as well. That could be the reason why xboxhdm says that it can't find the eeprom.bin file.
3. The Ndure softmod installs a Evox version on your E partition (apps folder) for the purpose of backing up your eeprom. (It depends upon the settings you selected.) Look for the ndts folder in your e partition and start the default.xbe there. The Unleashx that will come up has a backup option that will start the evox dashboard. The backup option of that one will backup your eeprom. Your shadow c drive and virtual eeprom will be disabled when you do it that way.
regards.
regards.