如何使用UWP C#备份U盘中的所有文件夹和文件？

using Windows.Storage;
using Windows.Storage.AccessCache;

public async void BackupUSB()
{
    // 获取U盘存储设备
    StorageDevice storageDevice = await StorageDevice.FromIdAsync(deviceId);

    // 获取U盘根文件夹
    StorageFolder rootFolder = storageDevice.RootFolder;

    // 备份U盘文件
    await BackupFolder(rootFolder);
}

public async Task BackupFolder(StorageFolder folder)
{
    // 创建目标文件夹
    StorageFolder destinationFolder = await ApplicationData.Current.LocalFolder.CreateFolderAsync(folder.Name, CreationCollisionOption.GenerateUniqueName);

    // 获取当前文件夹下的所有项
    var items = await folder.GetItemsAsync();

    foreach (var item in items)
    {
        if (item is StorageFile file)
        {
            // 将文件复制到目标文件夹
            await file.CopyAsync(destinationFolder, file.Name, NameCollisionOption.GenerateUniqueName);
        }
        else if (item is StorageFolder subFolder)
        {
            // 递归备份子文件夹
            await BackupFolder(subFolder);
        }
    }
}