Welf Alberts replied to the topic Backing up Bitlocker laptop in IT Administration Forum 1 month, 3 weeks ago
We use this since 2006 – never had a problem restoring such a backup no matter how it was created.
For DR, he would not need to use sector based backups nor disable or even suspend Bitlocker – that was his main fear, he confused suspending Bitlocker for disabling (decrypting) the drive, by the way, but even this (suspending) is not needed.