backup to test server and wp-admin link

Hi,

In order to test upgrade my friend website to latest version of WP, i decided to create a backup of DB and her website.
once everything reinstalled on my local testing server i try to log in admin side so https://www.mylocalwebsite.com/wp-admin but i’m very surprised to be redirected to https://www.friend-production-server.com/wp-admin.

how is it possible ?
how to fix this situation in order to allow me to log on my local testing server without been redirected to production server ?
thx