Does an "All-In-One" printer, fax, scanner, & copier have a memory like a regular copy machine?

I’m planning on selling my "All-In-One" printer. I’ve heard that regular copy machines (aka. xerox machines) have an internal memory that stores things you have copied, and I’ve heard people have been known to go through that memory to get personal information. I was wondering if "All-In-One" printers have this kind of internal memory as well. If so, does anyone know how to clear that memory? And how long does the printer usually store this information?

No. The older printers had memory in them, not these newer one.