Do you mean the ability to backup and restore your launcher config? If so, it doesn't get more minimal and awesome than T-UI

You'll want the F-Droid version as it is the most complete. It hasn't seen an update in ages, but it really doesn't need one. It's also all open-source, so you could always download the code from GitHub and do whatever you want to it

Lawnchair may be what you're after. It's open source and I find it very lightweight. Based off the pixel launcher.

long press on home, select home settings, select burger dots top right, backup and restore are in there. Took me a while to find.

https://github.com/LawnchairLauncher/lawnchair

I just saw that there’s a newish fork of OLauncher called CCLauncher. I’m going to be testing it out for sure.

CCLauncher on F-Droid

What are some of the ones you've tried and how do you define minimal?

I use action launcher but I guess that does quite a few things... I haven't changed my setup or layout in about 7 or 8 years!

KISS