But data loss is an issue. Network backups are great, and I use them, but they're bandwidth bound. Local external drive backups are great, and I do them, but less frequently. And I don't test my backups (yet)... do you? Having removable storage -- or even storage that's reliably accessible in the face of other component failure -- provides an extra margin against the risk of loss that can creep in even with a set of responsible backup habits.
What's the pro of soldering storage to the board that outweighs these cons?