The browser storage plugin can be helpful to avoid losing data when you have autosave disabled.
Changes are saved to local storage automatically with every edit. If you forget to save to Tiddlyhost, the changes will load from local storage the next time you visit.
The browser storage plugin is an official tiddlywiki plugin. I have an “opinionated” wrapper plugin which IMO makes it a little more usable out of the box.
You can play with the two plugins here: My TiddlyWiki — a non-linear personal web notebook
To install it, drag the two plugins from that wiki’s control panel into your TiddlyHost wiki.
My memory is fuzzy on this, but you might need to save and reload twice in order to get the RawMarkup portion of the core browser storage plugin to take effect.