Lost ability for Time Machine to automatically back up my iMac (Mountain Lion 10.8.5) to an external 500GB Western Digital Passport. It had been working for 6 months but now it automatically shows up in Time Machine as 'Exclude these items from backup'.
I can't remove it from the 'Exclude from back-up' as it is non-selectable. The external drive is working fine. I did a complete erase & started over as instructed. Thought I had solved the problem but the "new Passport" automatically ended up in the "Exclude these items from backup" too. I need this to work ASAP as I have 2,000 songs & 7,500 photos to protect.
iMac (21.5-inch, Late 2012), OS X Mountain Lion (10.8.5)