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I followed your instructions: I shut down the iMac and turned off the drive last night. This morning, I powered up the iMac, turned on the backup drive (which is connected directly to the iMac), attempted to do a backup, and received the same exact error message.
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iMac (27", 3.2 GHz Intel Core i5, 16 GB RAM, 1 TB HDD) • OS X (10.11.6)
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