At first I thought the app was working as I had set up weekly automatic backup and it always completed with 100% and when I checked the SD card it seemed like everything was on there. It turns out, nothing was being saved to the micro SD card, and I lost a bunch of important photos and other items. Support was completely unhelpful. I bought the SD card so this exact thing wouldn't happen because I had a similar issue before on a previous phone. Never again will I trust SanDisk or Samsung.