Check the disc surface under a lamp. See if there are any noticable deep scratches. Even if there is not, your options are limited. First thing to do is test other backups. If they still work, then try copying the backup to another disc. Ripping backups of 360 games is easy. You can use DVD Decrypter, or Xbox Backup Creator. The way I've always done it is mode-->iso-->read with DVD Decrypter. That will create the iso and a mds file. The mds is more or less worthless for 360 games, you'll want to manually create a dvd file to use with ImgBurn or CloneCD. That is very simple. Right click anywhere on your desktop. Select new-->text document from the right click menu. Just leave it named new text document.txt for now. Double click on the txt file and it will open notepad. Copy and Paste this into the text file.
Code:
LayerBreak=1913760
Game.ISO
In this example, Game.ISO is a generic example of a 360 iso. Replace Game.ISO with the name of the iso created with DVD Decrypter.
I.E.
Code:
LayerBreak=1913760
NBA 2K7.ISO
Make sure the second part matches the iso name
exactly.
Go to file-->save at the top of notepad. Close the text document. Right click the new text document and click rename or highlight it and hit F2. Rename the text document whatever your iso is called. Make sure you change the extension from .txt to .dvd!
I.E.
Code:
If your iso is NBA 2K7.ISO, name your .dvd file NBA 2K7.dvd
Hit enter or click off the dvd file. Windows will warn you about changing the name of file extenisons, click yes and the file will be renamed with the extension changing from .txt to .dvd.
Now you have a dvd file that can be loaded into ImgBurn or CloneCD, then just burn as normal to get a working backup. If you don't want to do that, then Xbox Backup Creator 2.4 and later will rip backups of 360 games. When I've copied a backup, I've always done it the way I mentioned, because I know it works. XBC probably works fine for copying a backup to another disc, but I've never done it that way. Using XBC will create the .dvd file automatically.