How to tell where a website is running from on a server to back it up

view full story

http://www.linuxquestions.org – I have a server that hosts a couple websites (a wiki and some other non-wiki internally created stuff) that uses a MySQL database running on that server. The server has a hardware problem (like I'm afraid to restart it again) so I want to backup the MySQL databases (which I think I figured out how to do through webmin) and the website itself. Only problem is, I'm not sure what i'm doing, just guessing here. On the server i went into /var/www, and I see that the html directory is redirected to our data drive on that server, and in that folder, it looks like it contains folders for the couple (HowTos)