You need to back up your Encrypting File System (EFS) certificate.
You must achieve this goal in the minimum amount oftime.
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:
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Cipher is used to manage certificates.
NOT Backup and Restore
Only the EFS certificate needs to be backed up and time is a factor.