make a backup of current user defaults

[skywinder]

Hello. I already changed a lot of user defaults. I would like to save these changes too. Since I don't remember all the settings, that I changed. It would be nice to generate yaml from current user defaults. is it possible to make this by read option?

[0xdevalias]

This would also make it possible to, for example, save a backup of the 'base' system state/settings, and then make a 'minimal diff' to see what settings I have actually changed since.