This complexity of logical and physical topology appears as a single directory tree (drive mapping), with sub-directories that may actually be located on remote servers.
把复杂的逻辑和物理拓扑显示为单一目录树(驱动器映射)，其中的子目录实际上可能位于远程服务器。
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What this has meant is that, in order to insure against computer crashes (which are eventually inevitable), you've had to back up your files to a remote disk (another drive, a CD-ROM, etc.).
Rather than storing files and documents on the computer’s hard drive, Chrome OS instead relies on data stored on remote servers, pulling these files, on demand, to any internet-connected computer.