how to copy a itunes backup to a new computer

Hello norbie85@msn.com,

Thanks for asking the Apple Support Communities about moving your backup to your new computer.

Depending on your computer and operating system, you can use the info here to find the backups file: Locate backups of your iPhone, iPad, and iPod touch - Apple Support

You don't need to copy that file though, just move your iTunes library, then make a fresh new backup of your current device to your computer. This gets you the most recent backup on your new PC.

Move your iTunes library to another computer - Apple Support

Back up your iPhone, iPad, or iPod touch in iTunes on PC - Apple Support

Thanks.