I have a 250GB SD card installed. It’s encrypted and I wanted to backup to this card. The graphic in Storage shows that it is full, but I have never used it. When I go to Backup, I press “Mount”. Most of the time it does not work. When it does work, it asks for a password. After the password is entered, the swirling graphic continues without stopping. I tried to erase the card and start over using Utilities, but still no success. Does anyone have advice? Thanks.
Update: I reformatted and changed the name of the SD Card. It shows “0 B” Used and “0 B” Free in Storage. In Backup, it still will not mount.