Returns backup file size.
PRL_RESULT PrlBackupFile_GetSize( PRL_HANDLE hFile, PRL_UINT64_PTR pnSize );
PrlApiBackup.h
PRL_RESULT. Possible values:
PRL_ERR_INVALID_ARG - invalid handle or null pointer was passed.
PRL_ERR_BUFFER_OVERRUN - the size of the output buffer is not large enough. The parameter that is used to specify the size will contain the required size.
PRL_ERR_SUCCESS - function completed successfully.
hFile : A handle of type PHT_BACKUP_FILE.
pnSize : A pointer to a variable that receives the result.