Restore a Backup

Hi there. Can anyone help me please? I have a backup (file .zip and file .sql) for an old website that i made it a couple of years ago with WordPress and located online with SiteGround. I have made this backup inside SiteGround and NOT with a plugin.
Now i would like to restore such website into a local server on my computer, such as localwp.
I made this procedure already 2 years ago with xampp and it was succesfull. Then i formatted my harddisk and canceled xampp as well. Now i don´t remember how i could do that again. I only remember that, after the importation of the backup, i need to rename or modify one or two files. Can anybody help me? Thanks a lot.