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syahzuan, Welcome to the XOOPS Forum!
If he wants the original presentation you need a working XOOPS. It is no big deal, you can do it on your local PC with eg XAMPP. Use the files and database backup to recreate the site on your PC. (See the FAQ about moving sites between servers.)
Depending on the manner of how its backup is created, he can retrieve also the bare texts of his postings. Mosttimes they are in the form of readable SQL statements, like create table .. and insert into table, fieldlist, data ...
With a normal text editor you can open this database backup and then search in the data.