My irreplaceable data is probably creeping up towards the 1 Gb mark now. If the city I live and work in was destroyed, I'd not lose it altogether, but would lose up to a year (depending on the last time I dumped a backup onto my father's pooter). And whilst it's not true to say I've never lost irreplaceable data, I've not lost much.

Also, the dividing line between irreplaceable property and irreplaceable data is becoming a bit blurred.