I had made quite a few final(ish) changes to Chanbara last month. I added a chart with various shinobi activities and standard TNs (target numbers) for them. I'd made a bunch of charts for rolling up random magic item powers, and charts for determining randomly what sort of item had been enchanted (more fun than having lists of standard items). I'd moved the campaign setting information to another file, to be released as a PWYW web supplement in order to free up those pages for the magic item charts and so on. I'd also come up with a random weather chart and some more concrete rules for wilderness exploration (based on the D&D Expert Set but not entirely identical).
Yesterday I lost my USB.
And I hadn't saved a back-up of the file on my work computer. I'm pretty sure I also didn't save a back-up on my home computer. But I'll need to wait until I get home from work this evening (and get the boys to bed) before I can check.
Yes, today, I kick myself.
Never fear, though. I more or less remember what I'd done. It'll just take time to re-do all of that.
Oh, and I'd copied the weather chart to use in my upcoming face-to-face 5E West Marches game, so at least I've got that.