Why is my external disk being backed up again by Time Machine?
I also use a 256gb external SD card in the MacBook Pro 15” to store music and videos unencrypted. I Have done so for the last 2 years With no issues, while backing up using time machine. @n1000 Interesting that my SD card was never included in the esclude list. So basically I never had to do anything other connect my external hard drive to backup everything on my Mac. I can add the SD to the esclude list manually.