Windows NTFS offers an embedded encryption system called EFS (Encrypting File System)
When activated on specific folders/files, the system encrypts/decrypts on the fly, transparently for users of the File Systems (given the presented account has necessary permissions)
Regarding Backup though, this transparency is not desirable, because if the backup behave as a standard user, files will be decrypted in the backup process and will have to be re-encrypted on the restore process.
This poses problem of security and CPU resources.
In order to workaround these issues, Microsoft provides a specific set of APIs (http://msdn.microsoft.com/en-us/library/aa363783.aspx) that can be used by backup software in order to backup / restore encrypted files in a "raw" manner, as there are, bypassing the on the fly process of decryption / encryption.
Backup software able to use these APIs are calle "EFS AWARE"
=> QUESTION : is Data Protector EFS aware ??