The Free On-line Dictionary of Computing (19 January 2023):

copying garbage collection

    A garbage collection method where memory is divided
into two equal
   halves, known as the "from space" and "to space".  Garbage collection
copies
   active cells from the from space to the to space and leaves behind an
invisible
   pointer (an "indirection") from the old position to the new copy.
Once all
   active cells have been copied in one direction, the spaces are
swapped and the
   process repeated in the opposite direction.

   (2022-10-30)