Czuch: As I said, delete the ones you don't want and if they are all in one folder you can just back up the folder. I had to re-install our PC recently and I just copied whole folders to disk and let the PC do the work.
But it means to do this easily that you've kept ya stuff together and not willy nilly. How big is all the data, etc?
(hide) If you don't want other users to know what you are doing you can change into cloak mode in Settings (paying members only). (pauloaguia) (show all tips)