If you are trying to perform EFS recovery by backing up encrypted files on a client machine and sending the backup file to a dedicated recovery workstation, remember this:
1) You need to be a local admin while performing the backup, and the restore, in order to back up the data stream even though you don’t have access to the encrypted files.
2) If a policy is disabling EFS on the recovery workstation, ntbackup won’t tell you that it can’t create the encrypted files because EFS is disabled. No. It will simply SKIP the files. So if you have files that get skipped, try to manually create a folder and encrypt it. It has to work else you will not be able to restore the backup properly..