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backup stuck

  1. M

    Time Machine Suddenly has Error

    I'm using Time Machine on my iMac (running OS X Yosemite) with a Seagate Backup Plus 4TB USB 3.0. I've been using it since February of 2013 on my Macbook Pro, and more recently on my iMac. I got home from work today and there was a notice that the last Time Machine backup failed. When I checked...