Once file redirection is configured and working, users will still be able to get to their My Documents folders as if it were still on their local computer. If you click Start and right mouse click My Documents àProperties, you will see that the My Documents is now located on remote storage. If users browse C:\Documents and Settings\username they will no longer see a My Documents folder.
File redirect is a useful way to ensure that your organizations data is always on a redundant, backed up storage device. Also consider implementing file storage quotas to ensure that a few users do not consume all of your storage space.
Folder Redirection: http://technet.microsoft.com/en-us/library/cc785925.aspx
Storage Quota: http://technet.microsoft.com/en-us/library/cc755917.aspx