Arf, well, if you have the .fhp files of your presets, you'll still be able to use them.
So long as your username still matches the .fhp file, you can easily slap the presets on your characters, still. While you won't be able to make any changes to their designs without the original files, since others will be able to see them on you, you should be able to as well.
Me hopes I'm making sense here...
Like, if I were to lose one of my preset's original files but I still have the .fhp, I can still slap the preset on since the file matches my username.
I can clarify if need be!