Hello I have a old server (Fedora) with ISPConfig running. For some new web sites I need to run MySQL5 (from 4 now) and a newer version of PHP. I need to be able to go back fast if I get issues. What dir/files do I need to back up?
If you want to go sure, make an image-based backup, e.g. with CloneZilla, SystemImager, or Ghost4Linux.