Error 0xC80001F9

Value: -939523591 | 0xC80001F9 | 3355443705

What does it mean ?

hrBackupInProgress  
Backup is already active.
Value: 505 | 0x01F9 | 0b0000000111111001

Where does it come from ?

FACILITY_NTDSB  
Active Directory Domain Services
Value: 2048 | 0x800 | 0b100000000000

Other Errors for FACILITY_NTDSB