What is the best way to update a theme?

Hi Team,

We use the edublog homepage theme and we make some edits in the child theme.

Well, now we have to update the theme.

What is the smartest way to do this?

Simply overwrite the edu-clean theme?
And add your additions in that theme to our child theme?

Won't we lose the theme options settings?

Maybe you have a manual for us how to update the theme?

Thank you in advance! Stijn