How do you backup EFS certificates? I personally use this method from command line: cipher.exe /x Simple a? :) And warning. Store this backup certificate to safe (also physical safe) place!!!
EFS (Encrypted File System) is a built in feature in Windows 2000, XP and 2003 that allows users to securely encrypt files and folders. But you can change encryption algorithm if needed. By default EFS use the DESX algorithm for encryption in Windows...