Originally Posted by 16pide
I would not advise to use the upgrade path (pre-upgrade, etc ...).
Every time I've tried it, I ended up with an unstable system.
I would backup my personal data to an external disk (full home directory, /home/myaccount)
install from scratch Fedora 14
get your personal data back (not the full /home/myaccount directory because I don't trust fedora 12 preferences to be good enough for fedora 14)
then get just a few preferences files that you don't want to redo manually (networkmanager wifi keys for example).
Personally, I run Fedora 13, and I'll wait for fedora 15 at end of May
I've used Preupgrade exclusively from every version of Fedora since Fedora 8 to Fedora 14 without issue. I can tell you that having /home on a separate partition at least for me, didn't cause a problem
But yes, clean DVD install would probably be the way to go if there are issues. I did get a problem at work where using Preupgrade from Fedora 13 -> Fedora 14 sometimes crapped out with "couldn't find root file system" error. But this didn't seem to be consistent and several retries later, it worked.