Like Andy said, my life won't be over if I lose this stuff, but I'd really rather not.
My risk is less than you suggest. My backups cover at least 10 years of data, perhaps more, but with my local external drives and my off-site external drives, I am only in danger of losing the most recent data, data added since the last backup, usually only about a week previous. Worst case scenario (house burns down taking my computer and backups with it) then I am at risk for the past two or three months of data, not pleasant but as you said, "my life won't be over..."
In any case, as I stood in the smoking ruins of what had been my house, my first thoughts probably wouldn't be about those books for my Kindle I downloaded last week.
tanstaafl.