Hi Karen, no we don't (if we can speak English properly). It makes me wince. The "back" idea is already conveyed by the re in return. But you will hear it, and it's a sure sign that the person speaking (if a native English speaker) is not well educated.
I'll be (right) back! If you say "I'll be back", we don't know when you'll be back. If you say "I'll be right back", it means you'll be back very soon (probably within seconds or minutes).