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I installed the Security Update for OS X Yosemite on my iMac. I think my back up was changed to iCloud and now my My Book no longer backs up. It says it is read only. How can I change it back so it will back up again?
iMac (21.5-inch Mid 2011), OS X Yosemite (10.10.5)
Hi there Theresa,
It sounds like you're no longer able to backup your computer to Time Machine because the drive appears to be read only. I would suggest using the troubleshooting in the following article in the section titled "Red "i" message: "The backup volume is read only.":
Time Machine: Troubleshooting backup issues
https://support.apple.com/en-ap/HT3275
Thank you for using Apple Support Communities.
Can you tell me how the MyBook is formatted?
I installed the Security Update for OS X and now my My Book no longer backs up. It says it is read only. How can I change this?
