I am going to follow the instructions you have outlined before I root my Samsung Galaxy S3 Mini I8910-N. I have only ever rooted one phone before and I wish I had backed it up.
Before rooting what about using apps like MyBackup Pro, Astro, Samsung Kies?
People talk about Titanium Backup and Clockwork Rom Manager but I think you need root first to use those?
Does your method do a better job than all of them? Is it the only backup method you would use for a pre-root device or would you use an app too, if so which one?
Does your method backup settings for paid apps?