We developers create pages on any disk, or resident in RAM if they're not bothering to save them for whatever reason. You can even use the tools in modern browsers to build pages directly inside them.
Web pages are normally stored in several places. The live version of the page that is available for consumption on the internet is stored on a web server, which is just a fancy computer running special software that let's it retrieve and deliver webpages to a browser.
Most development firms also employ some kind of source code control. This is a different server that keeps track of the changes to the code, allowing the developer to rollback a mistake, and rescue otherwise broken code. These pieces of software include the ever popular SVN, CVS, Git, and Visual Source Safe, among others.
Finally, most places keep a "hard" backup of released code. This may be kept on a hard disk or move over to a CD, DVD, thumb drive, etc, or simply stored on a limited access server physically separate from the other two servers previously mentions.
Chat with our AI personalities