tape to tape recording (aka dubbing) was a thing. It would be done in real time unless your deck had high speed dubbing, but that often resulted in a slightly poorer quality.
You could also record direct to tape from radio, LP, or CDs, so not sure why the microphone and background noise thing is an issue. Even before dual decks you could have separates where you could plug the output from one unit into the input of another.
Duplicating tapes from sources was a thing in the 80s for sure.






