Of course, I back up my files locally on a regular basis, and with greater frequency whenever I’m doing big adventurous work — like “clipping in” while rock-climbing.
But my point was that if TiddlyHost were to cease to be available (or to cease to be reliable), then an important feature (the fine-grained incremental backups — recently enhanced with labels, thanks to @simon) would be effectively lost. I have all those eggs in that one basket, because otherwise it would not be realistic to keep all those eggs at all I don’t think I’m confused about the importance of backing up. I’m simply wringing my hands over various ways in which TiddlyHost has been amazing, and (for my own case) there’s no other path that puts all those features together in such a lovely “just works” [until now ] way.
(As of just now, I tried to open three tiddlyhost sites: one was zippy, one took 30 seconds, and one gave me a gateway timeout after 60. Really feels random right now — not in a “small chance of a problem” way, but “small chance it’ll work responsively” way.)