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Fetch Help > Concepts > Mirror Documents
A mirror document lets you save the settings from the Mirror window to use again later. Mirroring lets you automatically copy all the new or changed files from a local Macintosh folder to a server folder, or vice versa.
If you want to mirror the same folders repeatedly, for example to keep a website up to date, a mirror document will save you time because you don't have to set up the Mirror window repeatedly. A mirror document can make uploading the website changes as simple as double-clicking.
Mirror documents can either start mirroring automatically when double-clicked, or just open the Mirror window filled out with the folders specified in the document.
You can create mirror documents with the Save button in the Mirror window.
To open a mirror document, either double-click it in the Finder, or choose File > Open in Fetch.
If the connections saved in a mirror document require passwords, you will be prompted for them when mirroring starts (either automatically or when you click the Mirror button). If you do not want to be prompted for passwords, you need to save the passwords for the connections in your keychain.
For more information about mirroring and creating mirror documents, see the Mirror window help topic, or the mirroring a local folder to a remote folder topic.