I agree, the best course of action for this is to open a new case, because I really can't provide any additional information on this- the StoreOnce documentation is really lacking as to how to deal with actual problems
You may be asked to debug the first store that you are having problems with. I suggest that you setup the debugging this way, since it is unique to StoreOnce
from the command prompt on the StoreOnce agent
cd \Program Files\Omniback\bin
sc stop Storeoncesoftware
sc start Storeoncesoftware -–log_level=tracing
Run your backup. This should create a debug file in
ProgramData -> Omniback -> tmp
that will start OB2DBG, and contain ‘storeoncesoftwarecore’ as part of the filename. After the error, go back to normal logging
sc stop Storeoncesoftware
sc start Storeoncesoftware -–log_level=no_log