OneDrive适用于(OneDrive)Windows 10的应用程序中最好的功能之一是名为Files On-Demand的功能。它可以帮助您节省 Windows 10 计算机和设备上的存储空间，方法是仅在您访问 OneDrive 文件或手动指定您希望它们始终离线可用时下载并保留 OneDrive 文件的本地副本。如果您想了解有关它的所有信息，包括如何启用或禁用OneDrive Files On-Demand、如何使用它们以及如何识别哪些文件是本地文件或仅在线文件，请阅读本指南：
什么是 OneDrive 文件点播？
Files On-Demand是一项功能，允许您使用文件资源管理器访问(File Explorer)OneDrive 云(OneDrive cloud)中的所有文件，无论它们是否下载到您的 Windows 10计算机或设备(computer or device)上。换句话说，您可以在文件资源管理器(File Explorer)中查看您的所有 OneDrive 文件，甚至是那些仅在线可用的文件，就像其他任何文件一样。Files On-Demand是在Windows 10 Fall Creators Update中引入的，它适用于所有较新版本的Windows 10。
现在的问题当然是：您如何区分仅在线文件与您的计算机或设备(computer or device)上本地可用的文件？此外，您可以打开或关闭Files On-Demand吗？您可以选择哪些文件和文件夹在您的驱动器上始终可用以供离线使用(offline use)？以下是所有答案：
OneDrive 文件点播：如何查看哪些文件可脱机（本地）和仅联机可用
在文件资源管理器中， (File Explorer)OneDrive中的文件和文件夹具有不同的状态指示器(status indicator)，具体取决于它们的存储位置：
- 仅限在线的文件和文件夹(Online-only files and folders)- 有蓝色的云图标(blue cloud icons)。这些是您存储在 OneDrive 存储中但未在 Windows 10 PC 上本地下载的文件。它们不会占用您的存储驱动器(storage drive)上的空间，但会占用您的 OneDrive 云空间中的空间。尽管您可以查看所有在线文件，但即使您没有有效的互联网连接(internet connection)，也只有在您可以访问互联网的情况下才能打开它们。
- 本地可用的文件(Locally available files)和文件夹 - 带有带有绿色复选标记的白色图标(white icons with green checkmarks)。这些是您打开的 OneDrive 空间中的文件，文件资源管理器(File Explorer)将它们下载并存储在本地计算机或设备上。(computer or device)因此，即使您没有可用的Internet 连接(internet connection)，也可以重新打开和使用这些文件。这些文件正在占用您的硬盘空间。如果需要，您可以恢复整个过程并通过再次使文件仅在线来回收您的本地存储空间。(storage space)
- 标记为“始终保留在此设备上”（始终可用）的文件和文件夹(Files and folders marked as "Always keep on this device" (always available))- 带有带有白色复选标记的绿色图标(green icons with white checkmarks)。这些是 OneDrive 中的文件，您已明确设置为始终可脱机使用，本地存储在您的 Windows 10计算机或设备(computer or device)上。它们会永久占用您硬盘上的空间，但具有始终可用的优势，无论您是否有可用的互联网连接(internet connection)。如果您选择取消设置这些文件和文件夹始终可用，您可以释放驱动器上的空间。
以下是Files On-Demand的三种状态在(Files On-Demand)文件资源管理器(File Explorer)中的外观：
如果您喜欢Files On-Demand的全部内容，您可能想要启用此功能。以下是如何做到这一点：
如何打开按需文件
在任务栏系统托盘(taskbar system tray)上，单击或点击(click or tap)OneDrive图标。
如果您在系统托盘(system tray)中没有看到OneDrive图标，请单击或点击(click or tap)^ button，然后点击OneDrive图标。
然后，在OneDrive 的(OneDrive's)弹出菜单中，单击或点击“...更多("… More)”。
OneDrive向您显示选项列表：转到Settings。
单击或点击设置(Settings)会启动一个名为Microsoft OneDrive的窗口。
在Microsoft OneDrive窗口中，选择“设置”(Settings)选项卡。
在Settings选项卡的底部，有一个名为Files On-Demand的部分。它只有一个选项：“在使用时节省空间并下载文件”。("Save space and download files as you use them.")要启用按需文件(Files On-Demand)功能，您必须选中此选项。
单击或点击确定(OK)按钮，您就完成了！
如何关闭按需文件
如果您根本不想使用Files On-Demand功能，您可以禁用它。不要选中名为“节省空间并在使用文件时下载文件”("Save space and download files as you use them,")的选项，取消选中它并按OK保存您的首选项。
OneDrive 要求您确认您的选择并通知(choice and informs)您“所有 OneDrive 文件和文件夹都将下载到这台电脑”。("All OneDrive files and folders will download to this PC.")如果您想继续并“按需禁用文件”，("Disable Files On-Demand,")请单击或点击OK。
如何使用Files On-Demand标记文件和文件夹以供(On-Demand)离线使用(offline use)
如果您启用了按需文件(Files On-Demand)功能，那么您可能想知道如何使您的重要文件在您的计算机或设备(computer or device)上本地可用。这样，即使您处于离线状态，也可以与他们一起工作，而无需互联网连接(internet connection)。幸运的是，选择是否将特定文件或文件夹配置为下载并始终可用很简单。在文件资源管理器(File Explorer)中，导航到您的OneDrive并找到有问题的文件夹或文件(folder or files)。
然后，右键单击它们（如果您有触摸屏，则按住）并选择“始终保留在此设备上”("Always keep on this device")以使它们始终在本地可用。
如果您改变主意并且不再希望您的某些文件或文件夹始终在本地可用，请按照相同的步骤操作，但这次取消选中“始终保留在此设备上”选项。("Always keep on this device.")
提示：(TIP:)如果您希望文件资源管理器(Explorer)始终打开OneDrive，请在启动时阅读：设置文件资源管理器(Set File Explorer)以在启动时打开OneDrive 或 Dropbox(OneDrive or Dropbox)（或任何其他文件夹）。
如何通过删除标记为按需(On-Demand)的文件的本地副本来释放空间（使 OneDrive 文件仅联机）
如果您的本地存储空间(storage space)有限，您可能更愿意让您的所有 OneDrive 文件仅在线可用。这样，它们就不会占用您的 Windows 10计算机或设备(computer or device)上的空间。但是，您可以与他们合作，但前提是您连接到互联网。
要将部分或全部文件或文件夹配置为仅在您在线时可用，请打开文件资源管理器(File Explorer)，导航到您的OneDrive，然后找到您希望仅在线可用的文件或文件夹。选择它们，然后右键单击它们（或按住它们，如果您有触摸屏）。在上下文菜单上，单击或点击名为“释放空间”的选项。("Free up space.")
然后，Windows 10 将删除这些文件或文件夹的本地存储副本，但将在线原始文件保留在原处，不变。这可能是恢复设备存储空间(storage space)的绝佳方式，尤其是在OneDrive中存储了大文件时。
您是否使用OneDrive的按需文件功能(Files On-Demand feature)？
如您所见，从Windows 10启用和使用新的(Windows 10)Files On-Demand OneDrive 功能很容易。只需单击几下，您就可以让文件资源管理器(File Explorer)显示您的所有OneDrive文件，无论它们是在本地还是仅在线可用。您是否使用OneDrive的按需文件(Files On-Demand)功能？在下面的评论中分享(Share)您的意见。
OneDrive Files On-Demand for Windows 10: All you need to know
One of the best things in OneDrive's app for Windows 10 is a feature called Files On-Demand. It helps you save storage space on your Windows 10 computers and devices, by downloading and keeping local copies of your OneDrive files only if you access them, or if you manually specify that you want them to be always available offline. If you want to learn all there is to know about it, including how to enable or disable OneDrive Files On-Demand, how to use them, and how to identify which of your files are local or online-only, read this guide:
What is OneDrive Files On-Demand?
Files On-Demand is a feature that allows you to access all your files in the OneDrive cloud, with File Explorer, regardless of whether they are downloaded or not on your Windows 10 computer or device. In other words, you can see all your OneDrive files, even those that are available online-only, in File Explorer, just like any other. Files On-Demand was introduced in Windows 10 Fall Creators Update, and it is available in all the newer versions of Windows 10.
The question now is, of course: How do you differentiate the online-only files from those available locally on your computer or device? Furthermore, can you turn Files On-Demand on or off? Can you choose which files and folders are always available on your drive for offline use? Here are all the answers:
OneDrive Files On-Demand: How to see which files are available offline (local) and online-only
In File Explorer, the files and folders from your OneDrive have a different status indicator depending on where they are stored:
- Online-only files and folders - have blue cloud icons. These are files that you have stored in your OneDrive storage but which are not downloaded locally on your Windows 10 PC. They are not occupying space on your storage drive, but they are taking up space in your OneDrive cloud space. Although you can see all online files, even if you do not have an active internet connection, you can only open them if you have internet access.
- Locally available files and folders - have white icons with green checkmarks. These are files from your OneDrive space that you have opened, and File Explorer downloaded and stored them on your computer or device, locally. Thus, these files can be reopened and used even when you do not have a working internet connection. These files are taking space on your hard drive. If you want, you can revert this whole process and reclaim your local storage space by making the files online-only again.
- Files and folders marked as "Always keep on this device" (always available) - have green icons with white checkmarks. These are files from your OneDrive that you have explicitly set always to be available offline, stored locally on your Windows 10 computer or device. They are permanently taking up space on your hard drive but have the advantage of always being available for use, regardless of whether you have a working internet connection or not. If you choose to unset these files and folders from being always available, you can free space on your drive.
Here is how the three statuses for Files On-Demand look in File Explorer:
If you like what Files On-Demand is all about, you might want to enable this feature. Here is how to do that:
How to turn on Files On-Demand
On the taskbar system tray, click or tap on the OneDrive icon.
If you don't see the OneDrive icon in the system tray, click or tap on the ^ button, and then on the OneDrive icon.
Then, in OneDrive's flyout, click or tap on "… More."
OneDrive shows you a list of options: go to Settings.
Clicking or tapping Settings launches a window called Microsoft OneDrive.
In the Microsoft OneDrive window, select the Settings tab.
At the bottom of the Settings tab, there's a section called Files On-Demand. It has only one option: "Save space and download files as you use them." To enable the Files On-Demand feature, you must check this option.
Click or tap on the OK button, and you're done!
How to turn off Files On-Demand
If you prefer not to use the Files On-Demand feature at all, you can disable it. Instead of checking the option called "Save space and download files as you use them," uncheck it and press OK to save your preference.
OneDrive asks you to confirm your choice and informs you that "All OneDrive files and folders will download to this PC." If you want to go ahead and "Disable Files On-Demand," click or tap on OK.
How to mark files and folders for offline use with Files On-Demand
If you have enabled the Files On-Demand feature, then you might want to know how to make your important files available locally on your computer or device. That way, you can work with them even if you're offline, without a working internet connection. Fortunately, choosing whether specific files or folders are configured to be downloaded and always available is simple. In File Explorer, navigate to your OneDrive and find the folder or files in question.
Then, right-click on them (or press-and-hold if you have a touchscreen) and select "Always keep on this device" to make them always available locally.
If you change your mind and no longer want some of your files or folders to be always available locally, follow the same steps, but this time uncheck the option "Always keep on this device."
TIP: If you want File Explorer to always open OneDrive, when you start it up, read: Set File Explorer to open OneDrive or Dropbox (or any other folder) when starting.
How to free up space by removing local copies of files marked as On-Demand (make OneDrive files online-only)
If you have limited local storage space, you might prefer to keep all your OneDrive files available online-only. That way, they never take up space on your Windows 10 computer or device. You can, however, work with them, but only as long as you are connected to the internet.
To configure some or all of your files or folders to be available only when you are online, open File Explorer, navigate to your OneDrive, and then find the files or folders that you want to make available online-only. Select them and then right-click on them (or press-and-hold on them, if you have a touchscreen). On the contextual menu, click or tap the option called "Free up space."
Windows 10 then deletes the locally stored copies of those files or folders but keeps the online originals in place, unaltered. This can be an excellent way of recovering storage space on your device, especially if you have large files stored in OneDrive.
Do you use OneDrive's Files On-Demand feature?
As you have seen, enabling and working with the new Files On-Demand OneDrive feature from Windows 10 is easy. With just a few clicks or taps, you can make File Explorer show all your OneDrive files, regardless of whether they are available locally or online-only. Do you use OneDrive's Files On-Demand feature? Share your opinion in the comments below.
