I Cannot Backup Certificate server DB

Hi heshan_steve,

You could refer to Mark B. Cooper's answer in the thread discussing the same issue over here:

https://social.technet.microsoft.com/Forums/en-US/453a2991-2b65-414b-b0f4-ec90f8204889/windows-cannot-backup-one-or-more-private-keys-because-the-csp-does-not-support-key-export?forum=winserversecurity

Best regards,
Leon