You say this as if Granny doesn’t have tea and crumpets with the person who can sell her that tiny house every saturday. If she wants to downsize affordably, she should take it up with her ‘Golden Age Bookclub’ buddies who own all the other houses in town…
As mentioned before, disks are great for archiving files for long-term storage, so they eould work for that. You could also see if you have any non-techie freinds who want/need a cd or two burned (though not likely, still possible).Alternatively there are quite a few crafts you could try.