Where are the cached files stored?
The default location for cached content is the boot volume. You can choose an alternate location and specify how much of the volume is used by Caching service. When the caching server receives and accepts requests to download and cache content, more of your disk space is used to store the cached content. When the disk space for the cached content reaches the maximum you specified in the Caching pane, or when the available space on the volume reaches 25 GB, the caching server deletes the least used cached content to make space for the next request.