The location of the backup files from iTune
It depends on the computer’s operating system:
Documents and Settings(username)Application DataApple ComputerMobileSyncBackup
Windows Vista and Windows 7:
To extract files in the backup
If you had created a backup of your device on your system (and not on iCloud), then they would be present under the AppData (Application Data) folder on Windows and under /Application Support/Mobile Sync on Mac.
Now, if you are an expert with computers, you can use a sqlite explorer/editor to open up those files. They are sqlitedb files and will contain all of the information.
Unless, you chose the option to encrypt the iTunes backup which would have encrypted those files and opening them with a query browser will not be possible. To unencrypt the files use total saver pro http://www.myphonedata.com/products/totalsaverpro
It will also extract the data for you from those files.
Hope this helps!