Your network consists of an Active Directory domain. The domain controllers run Windows Server 2008 R2. Client computers run Windows 7.  
You need to implement Encrypting File System （EFS） for all client computers. You want to achieve this goal while meeting the following requirements：  
èYou must minimize the amount of data that is transferred across the network when a user logs on to or off from a client computer.  
èUsers must be able to access their EFS certificates on any client computers.
èIf a client computer s disk fails， EFS certificates must be accessible   
What should you do？（）

Your company has Windows Server 2008 R2 file servers.  
You need to recommend a data recovery strategy that meets the following requirements：  
èBackups must have a minimal impact on performance.  
èAll data volumes on the file server must be backed up daily.  
èIf a disk fails， the recovery strategy must allow individual files to be restored.  
èUsers must be able to retrieve previous versions of files without the intervention of an administrator.  
What should you recommend？（）