In part 1 of these series we discussed the merits of Azure file sync. One of the options of this technology is Cloud tiering. This feature of Azure File Sync in which frequently accessed files are cached locally on the server while all other files are tiered to Azure Files based on policy settings. When a file is tiered, the Azure File Sync file system filter replaces the file locally with a pointer, or reparse point. In the event a user needs a file which has been cached, Azure File Sync quietly downloads the file from Azure Files from the cloud.