All depends what you have but the following are all you are likely to need but may not need all.
the xml for the profile you use,
the macro folder for the profile you use (tooltable and fixtures are in here)
Brains folder if you have made any,
Licence files (Mach1Lic.dat for Mach and WizLic.dat for NFS wizards)
Bitmaps folder if you have made or use a custom screen
The screenset itself..
Plugins folder if using some plugins.
Think thats about it.
Hood