For me? All of them that matter. I mostly print on gelatin silver paper in a darkroom, and I don't use digital inkjet paper that contains OBAs. I have digital

For me? All of them that matter. I mostly print on gelatin silver paper in a darkroom, and I don't use digital inkjet paper that contains OBAs. I have digital copies, of course, too, and those are stored on my iMac, in a backup hard drive, in Backblaze, and on S3.