I'd like to upgrade to 12.04 but I've had some really bad experiences with upgrades (vs. fresh installs). I've backed up my 11.10

I'm running a web server on my desktop distro that has an SQL database and I'd rather not mess with it if at all possible. How do I make sure that the server is backed up as well?

If everything goes the way it should, will the upgrade affect my server or will it work around it?