I think the reason why it didn’t work on your external drive is that is a different permission to system files. Something to do with usb stuff.
When it comes to backing up your home files, I’m not sure what you mean by home file? Do you mean the home folder? Cause if so I don’t think SaveDesktop can do that as that includes all your files, not just your configs. You’d have to use another tool to move those folders.
This doesn’t answer the primary concern though. Do male lions have the same hunt participation rate after being in a pride? All this paper talks about is strategy. Everyone knows male lions hunt, they have to before they get a pride. But what about after? Do they hunt at the same rate? Or just stop altogether?