Need help to re-store site from backup files

We was hired a freelancer to install our site a new one, in order to maximize its performances, However, he was not able to do this and give back us the backup files as below:
For your information, we are not sure now that previous IT (freelancer) backup enough databases and other files of or not, but we are only received back 2 files as below:
- nhadepnetcngthngtingthitkvkintrc-cngtytnhhphngbc.wordpress.2017-12-30.xml
You can see them, which are in folder ‘public_html’ in fpt.
Could you please to take a look and help to re-store our site

Thank you,
Kha Tran