Because “cut and paste” is a familiar phrase, many people say it when they mean “copy and paste” in a computer context. This can lead to disastrous results if followed literally by an inexpert person. If you mean to tell someone to duplicate something rather than move it, say “copy.” And when you are moving bits of computer information from one place to another the safest sequence is often to copy the original, paste the copy elsewhere, and only then delete (cut) the original.