One of the worst calls I'd get when I used to do technical support for Psion's kit was usually from someone who had been storing all their "valuable data" in the internal RAM- which required power. They'd inevitably let the battery run down or fail to swap the battery within the 30 second time frame and puff went all their data. And I'd get a phone call demanding that I restore their "valuable data". I eventually developed a copying strategy which went something like:
Me: "Don't worry, we can easily get that back. What I need you to do is get your last backup..."
Customer: "But I've never done a backup."
Me: "I thought you said your data was valuable."