When Blender can't find an image-based texture in a node-based material, it just replaces that image with purple. Sometimes I accidentally move files on my hard drive, and Blender replaces parts of my render (the missing image-based textures) with purple, which I sometimes don't realize until I've finished a 20 hour render... For example, in After Effects, I can just search for "missing" in the search box and all missing files in that project show up. Where in Blender (2.8) can I find a list of missing files, like image-based textures (JPG, PNG etc.)?
If you make File > External Data > Find Missing Files you'll find your files but I don't know how to easily show their location. You could pack them all with File > External Data > Pack All Into Blend then unpack to another folder if necessary: File > External Data > Unpack All Into Files.