How do I import a site backup (xxx.tar.gz) in Local?

I’m trying to restore a live site backup into a Local installation. The backup is a “tar.gz” format.

This is a totally newbie question… How do I proceed?

Thanks!

I’m running Mac OS Mojave (10.14.6).

I’m still trying to get this backup imported into Local. Can anyone give some advice or guidance? Thanks!