Can't get iPod to back up. Help?

Question

I asked this question two days ago, and information below on the question...
"I can't get my iPod touch to successfully backup. It's the only issue I have with my iPod. I plug it in, and then I hit the sync button for it. Both, my iPod touch and iTunes are the newest version right now. I've had this problem before other versions, but it seemed to manage somehow.
Right before the backup load bar, it keeps restarting what I believe. I get the apple symbol and the loading pinwheel icon together, and the beeping noise. It still continues to go through the process, but near the end, right before its complete, the iPod whitescreens and then turns off completely. It doesn't create a backup, and then back at the beginning.
Can someone help me? "
Then someone said to restore my iPod touch as a new iPod touch, a complete full restore, this is my post to that.
"Alright. I think this is likely my only alternative now if I wish to continue using my iPod touch, with syncing and likely other things. I really did not wish to go down this route, as I had just redownloaded a ton of things from the internet a couple days ago, taking up two whole days in the process. This consisted of only 15GB worth of data.
If it isn't this, and lost my game progressions and other things to still come with a similar result, it must be a hardware problem then, no? Or does hardware problems even cause this issue?"
I did a complete restore. When I had my iPod roughly halfway full, done with the restore, it actually had backed up successfully and went smoothly. Now I have finished getting everything back on it, and it's roughly 3/4 full now. I just now went to try to back up my iPod touch, and I have enough space for it, and more, but, it will not back up, this same problem has once again came back. I highly doubt this is a mere coincidence. What other possibilities are there that could cause this? It never has been jailbroken or anything to that effect either. iPod touch and iTunes are the most recent version, and all.
Please help?

Answer 1

Try moving the existing backup file to a safe locations so that iTunes has to create an entire new file.  The backup is located here:
iTunes places the backup files in the following places:
Mac: ~/Library/Application Support/MobileSync/Backup/
Windows XP: \Documents and Settings\(username)\Application Data\Apple Computer\MobileSync\Backup\
Windows Vista and Windows 7: \Users\(username)\AppData\Roaming\Apple Computer\MobileSync\Backup\
Note: If you do not see the AppData or Application Data folders, you may need to show hidden files (Windows XP,  Windows Vista and Windows 7), or iTunes may not be installed in the default location. Show hidden files and then search the hard drive for the Backup directory.