I got permanent error in event viewer:
Volume Shadow Copy Service error: A critical component required by
the Volume Shadow Copy service is not registered. This might
happened if an error occurred during Windows setup or during installation
of a Shadow Copy provider. The error returned from CoCreateInstance on
class with CLSID {e579ab5f-1cc4-44b4-bed9-de0991ff0623} and Name
IVssCoordinatorEx2 is [0x80040154, Class not registered].
Operation:
Instantiating VSS server
After googling for some time I found an answer: I had installed 32-bit bacula version by mistake... After installing 64-bit version, everything started working...