Sets the backup level.
PRL_RESULT PrlBackupParam_SetLevel( PRL_HANDLE hBackupParams, PRL_BACKUP_LEVEL nLevel );
PrlApiBackup.h
PRL_RESULT. Possible values:
PRL_ERR_INVALID_ARG - invalid handle or null pointer was passed.
PRL_ERR_OUT_OF_MEMORY - out of memory to create backup object.
PRL_ERR_BACKUP_IN_PROGRESS - parameter can not be changed because the backup operation already started.
PRL_ERR_SUCCESS - function completed successfully.