You can't "backup" installed programs unless you use an image.
If you buy a new PC which already has Windows installed on it, you likely would not want to restore an image from another machine anyway.
If you buy a new PC, you should be prepared to re-install your programs.
You can backup your personal data without an image---most commonly to an external drive or to a USB drive.
Here is a tutorial on Easy Transfer. Personally, I have not had any good luck with Easy Transfer, but your mileage may differ. You should definitely make a backup of your personal data regardless. Windows Easy Transfer - Transfer To & From Computers