Maybe it’s a hand-me-down from an elderly relative. Maybe you found it at a flea market, or it has been hidden in the attic for far too long. It could be an anonymous-looking black box with big dials ...

So you’ve upgraded to a brand-new laptop at last—or perhaps you’re finally clearing out clutter—and now you’ve got an old laptop to deal with. What to do with it? That depends on your circumstances, ...