Oh sorry. Didn't realize anyone was interested in my filing system. I use a program called NeoFinder to catalog my backups, whether on DVD or external drives. It makes a searchable list of everything on the DVD including thumbnails. I have 35 categories saved in folders. For instance all photos from my iPhone 7 Plus are in that category and I keep only iPhone 7 photos on those DVDs. Numbered iPhone 7-1 to iPhone 7-xxx. Likewise each other camera, iPhone 5, iPhone 6, GoPro3Plus, Olympus TG-4, etc. Then there are backup files for just about everything else. System files, Image Bank files, Photos back-up (this is mostly completed more complex edits from PhotoShop), Raw Video Files, Edited Video Clips, Video Project Files, and several other work project files, etc.
Current DVD count 2341. The DVDs are in sleeves in drawers grouped in categories. Once a search has determined that the image in question is on iPhone 7-25 I just go to where the iPhone 7 DVDs are and look for #25. They are in order, of course.
After my photos have been imported using Lightroom and the initial metadata added, picks and duds, ratings, superficial edits then they are all backed up before anything is discarded. Only the picks go on to my Image Bank.
I file my finished photos in a category system in my Image Bank so they are likewise easy to find, even without a search.