When I visited my elderly mom in Germany recently, I realized it could be one of the last times I see her in the cozy little house she has called home for more than two decades. So I did what anyone would do: I busted out my phone and took lots of photos of the place to preserve as many memories as possible: the warm fireplace; the shelves full of familiar books; the rickety old garden bench up front that everyone signed during a special birthday celebration many years ago. Then, I tried