Might help someone, One possible cause
On a Linux CM, in the directory /var/opt/omni/server/db80/pg/ was a file
-rw-------. 1 hpdp hpdp 0 Jan 4 12:32 /var/opt/omni/server/db80/pg/backup_label
On the Windows CM, in the directory C:\ProgramData\OmniBack\server\db80\pg was a file
01/06/2016 01:12 PM 0 backup_label
SOLUTION
After deleting the backup_label file in
/var/opt/omni/server/db80/pg/ - linux CM
\ProgramData\OmniBack\server\db80\pg - windows CM
it was possible to start the "hpdp-idb" service