Best way to upgrade from FC5 to FC8

[DJ Delorie]

What I've taken to doing is booting a rescue CD, creating a top-level
"/old-system" directory, and moving all the top-level directories
(including mount points etc) into it.  That leaves me with a disk that
is clean enough to do a fresh install on without needing a format, and
when the install is done, all my old directories and files can be mv'd
back into place as needed.

Of course, I do backups *too* but I don't use a restore as part of an
upgrade.