Thanks Mark. It seems to me that any mind copies are simply a forking of our identities, which will instantly start to diverge once copied. Biology does a crude version of this with genetically near-identical twins, technology will eventually be able to do this with minds. We do it in our own minds perhaps, crudely, when we argue with ourselves over long periods of time. Yet that copying tends to have sharply declining value as it proceeds, since all of us are limited in complexity and nature loves individual diversity as a way to maximize our collective adaptiveness. Having a few unexpressed copies in an archive, as backups, is a great strategy however, and nature does this extensively with seeds and other biological archives. I think we can expect that in a world of uploads as well. Hope this helps.