[User 224999]

Then it generate the zip file but guisettings.txt enclosed only contains "[]"
I also noticed it backups all the skinshortcuts overrides, is it always the case and necessary ?

I will take a look. tbh I did not really test that parameter stuff very well. I'll experiment with it some more and let you know.
In the full backup the skinshortcuts are also backupped, together with the skin-specific properties.
It shouldn't do that with the parameter option however, I'll look into that.

EDIT: I think you're on Kodi Jarvis, right ?
I didn't yet implement support for that. It was still on my todo. Now implementing it however ;-)