The Mirror window lets you automatically copy all new or changed files from a local Macintosh folder to a remote folder on a server. For example, if you keep all the files that make up a website in a folder on your Macintosh, mirroring can quickly upload only the files that are new or have changed since your last update, instead of using the Put command to upload the entire site again.
To mirror a local folder to a remote folder:
Note that the first time you mirror a local folder to a remote folder, Fetch will most likely upload all your files, because it needs to start by synchronizing all the files. But the next and all subsequent times you use the Mirror window for the same folders, only new or changed files will get uploaded.
If you're going to mirror these folders often, you can save these mirror settings as a mirror document. This will make uploading the changes a simple one click process:
From now on, you can just open the mirror document instead of selecting the local and remote folders each time.
You can also mirror a remote folder to a local folder (choose the bottom arrow button instead of the top), or mirror two remote folders (click the Remote tab in the left-hand pane, and choose two remote folders).
For more information about mirroring and the Mirror window, see the introductory or in-depth Mirror window help topics.