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sierra fears

  1. D

    final help before upgrade from 10.7 to Sierra

    hi, literally about to upgrade from 10.7 to sierra on I'm iMac (mid 2011) . Ok so I've backed up to Time machine and my Seagate Exteranl drive. If this dosent work for whatever reason and i can't see any of my files can i reverse the process and get back to where I am now via Time machine or...