The specified volume already exists or contains data, so that the server cannot allow new BACKUP DB data to be written to it. Or there is no space available on the destination filespace to write this backup to.
The server detects that the given volume already contains some data that would be overwritten by the requested BACKUP DB command, or that there is not enough space available.
If the specified volume does not contain any valuable data, delete it and retry the BACKUP DB command.