“personal” and “trustless” seem sort of at odds here. you want personal data, so you want personal storage.

what I recommend, if you have the time and energy, is to find another self-hoster you trust and be “backup buddies” with them. set up remote file storage on both your networks and send your backups to the other person’s server.

if you can’t find another self-hoster, then find a friend or family member you trust and mail them your backups on a physical disk.

11ty is my favorite! cross-platform, good defaults, built-in tag support, and just generally good learning curve.

My favorite static site generator by far is Eleventy, which you can learn by reading their sample code at eleventy-base-blog. It uses NodeJS which runs on all major platforms, and it generates plain old HTML that you can put on any static host. I played with several of the generators on the Jamstack list, and decided that this is the one I’m most comfortable recommending. It has a very high power-to-effort ratio, you can do some really useful stuff with very little knowledge. I’m using it on my personal site, https://nycki.net/, to automatically generate a “navbar” on every page, plus an RSS feed for my blog. It’s also nice for generating “prev/next” links under articles.