I'm getting this error dialog whenever I try to back up and I have no idea what to do about it:
[Window Title] Windows Backup: Troubleshooting Options
[Main Instruction] Check your backup
[Content] Windows Backup failed while determining libraries location of one of the users included in backup.
Details: BitLocker Drive Encryption cannot be used because critical BitLocker system files are missing or corrupted. Use Windows Startup Repair to restore these files to your computer.
Error code: 0x81000031