You need to back up your Encrypting File System (EFS) certificate.

You must achieve this goal in the minimum amount of time.

What should you do?

A.
Run Cipher.exe /x.

B.
Run Ntbackup.exe /p.

C.
From Backup and Restore, click Back up now.

D.
From Backup and Restore, click Create a system image.

Explanation:
Cipher is used to manage certificates.

NOT Backup and Restore:
Only the EFS certificate needs to be backed up and time is a factor.