Based on my understanding yes you could back up the Preset directory or you could go into each preset and select all of your materials and export them as one group to a place of your choosing and then re-import them after your fresh install. Oh yeah, after you install bryce before you do anything else, delete the presets you want to install and then just re-import all of your previous presets. They will come in as a group just like they went out. Theres a great tutorial on this in this forum. I think it's called "Downsizing Bryce". It'll explain in a little more detail what I'm talking about. This method can be a pain, but it's effective. Hope it helps. Nuke