After some advice please.  I have a Mac desktop running Monterey attached to a Time Machine. The whole system is old, slow and clunky, scrambled and difficult to navigate, I think of it as spaghetti!  If I was to purchase a new desktop and transfer across I would be infesting the new mac with the old “spaghetti”. Is there a way of saving the contents externally, reinstalling with a more recent OS and selectively repopulating?  Similar deal if I was to get myself a new machine.  You may have some other ideas and I would be happy to listen.  Jaz