Backups of music CDs not playing

[Zappo]

This is happening more and more often. I burn a backup of a music CD, and when I try to play it, I hear no sound. The tracks are found, the time display shows the CD being played, but it's as if only silence was recorded. I managed to get around this a couple of times by saving the tracks to disk with Nero and then burning them on a CD, but now I'm stuck with a CD of which I can't save the tracks due to some protection.

ClonyXL detects no protection on the audio CD.

My burner is an ASUS CRW-4816A.