I have a few things it would annoy me very much to lose, and a few quite expensive things, but nothing I couldn't carry on from.

I have no data I genuinely need, but quite a bit (schedules, notes, fiction) it would be very aggravating to lose. It's not officially backed up, but is periodically updated between my computer, and a colo server. I need a better system, but if I lose a few months, that's not such a big deal (unfortunately, or I'd have got around to it).

That would survive my continent being nuked to the bedrock. I'm not sure how I could survive loss of my planet -- I'd probably take my laptop with me if I did. Probably in a sophistry Egan way, in which case I would have the data...