All data are stored in database so this is the first thing which you must restore. Configuration files are in your settings/override and settings/siteaccess/(prefix)/ Images, and other files are stored in /var/(prefix)/storage. I hope this help.
I have noe upgraded til ver 3.5.0. And I need to execute some files in order to make a update....how do I execute them? Can I use a command in WS_FTP Pro??