Yes—search for "behind the scenes" or "setup shots" rather than "backstage." Good places to look include Flickr group pools focused on studio lighting, posing, and studio/set environments. One useful community mentioned is S.U.M. (Setups Mandatory), which shows both the setup and the final image, making it easier to understand how a shot was made.

For more professional examples, look for behind-the-scenes content from photographers who publish their process online, such as Chase Jarvis and Dave Hill. The F-Stop was also noted as a source for setup images, composites, and interviews discussing how images were created.

If you want deeper explanations of lighting decisions and portrait setup choices, older Shutterbug magazine articles by Monte Zucker were recommended as a strong reference, and may be available through libraries or personal archives.