Once you've copied a website, how do you download only new and changed files? The WebCopy UI isn't clear in this regard, so here's a few tips.
First, in order to copy only the changes to a website, the website itself needs to support the
ETag headers, and you need to set up your project in a specific way.
- The Save link information in project option should be set
(Category: <1.8 General\Links, 1.8+ Advanced\Link Map)
- The Empty website folder before copy option should not be set
- The Always download latest version option should not be set
(Category: <1.8 General\Advanced, 1.8+ Advanced)
This combination of settings should ensure that WebCopy only copies new and changed files. However, if the website doesn't return a
304 "Not Modified" response code, WebCopy has no way of knowing if the file is unchanged or not, and will proceed with the re-downloading the file.