%1上的备份媒体是媒体簇 %2 的一部分，该媒体簇已在 "%3" 上进行了处理。请确保正确指定了备份设备。对于磁带设备，请确保加载了正确的卷。

The backup media on "%1" is part of media family %2 which has already been processed on "%3". Ensure that backup devices are correctly specified. For tape devices, ensure that the correct volumes are loaded.