The technology behind commercial backup-and-restore solutions—including Microsoft Backup and Restore—varies greatly; therefore, restoring volume(s) directly on a disk encrypted by Symantec Drive Encryption is not guaranteed.
A best practice for successful restoration is always to decrypt the disk first.
If you cannot decrypt the disk before attempting restoration, follow the workarounds below at your own risk:
To reset the MBR:
Note that an overall best practice for creating useful backups is to choose volume-based backups, not file-based.