All your b2evo data is stored in the database (as lots of secret hidden files somewhere), phpMyAdmin will let you look at the database... Is that what you were asking?

Your blog is a combination of files and your database. The posts and most of the conditions you set up about your blog (info you enter in the back office) are stored in the database, so you'll never find that stuff in a file. The files do all the work to take the info from the database and turn it into a webpage for your visitors.