If you want to delete it all, what I suggest you do is move all the files to another directory ( /test_move ?) and move it out of the public_hmtl file and then upload all new files. See if you site then runs. If you had any modifications that required files, then make sure you reupload all the files. Check that you can upload avatars and attachments. Check all functionality on your site, and if it works, turn it back on. If it all works for a week or so, then you can delete the other directory ( /test_move ) of the site you made.
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