How do I listt all media used on a website so I can purge redundant files from the server?

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That actually helps clarify things 🙂

With a relatively small static site built mostly with HTML, CSS and basic JS, the problem becomes much more manageable than I initially imagined.

In that context, as proposed by ​@Nancy OShea tools like Xenu or Screaming Frog may indeed get you surprisingly close to what you're looking for, since most of the references are likely to be directly visible in the pages themselves.

The challenge then becomes less "finding what is used" and more "identifying what is not used". Once you have a list of the files actually referenced by the site, the task is simply to compare that list with the files present locally. A file comparison tool such as UltraCompare could do that very efficiently: the referenced files are kept, while the unreferenced ones are identified and removed from the local folders.

One important precaution, however: before deleting anything locally or synchronising the local copy with the server, make absolutely sure that your local site is fully up to date with the live version. The online site is the version currently doing the job, so if there is any doubt, download and synchronise from the server first. Otherwise, you risk removing files that are still being used on the live site but are missing from an outdated local copy.

Once you are confident that the local and live versions match, you can proceed with the cleanup. After that, synchronising the site, using DW, would remove from the server any files that no longer exist locally (although empty folders would likely need to be deleted manually, as Dreamweaver does not usually remove them automatically).

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