You can back up a disks or volumes in Windows, and restore disks from Acronis Bootable Media or volumes in Windows. The "Clone" operation is not supported
Acronis Secure Zone cannot be created on a disk protected with low-level encryption software
This article provides answers to frequent questions on BitLocker support in Acronis True Image. Read the full article on BitLocker support at https://kb.acronis.com/content/56619
Q: Does Acronis True Image support BitLocker-encrypted disks?
To back up the system encrypted with BitLocker you will need to create an image from Windows