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Time Machine says 100% of the time after a backup that verifcation failed and it needs to re-do the backup.

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  • I use a 4TB WD MyCloud and backup over wifi. The SAN itself is connected to the router via ethernet.
  • I'm running OS X El Capitan (10.11.3).

How can I debug this issue?

  • Please provide more info about your system. What OS X version(s)? How is the target disk connected to the network? Have you already tried reformatting the target disk? Etc... – tim.rohrer Mar 20 '16 at 22:48
  • @tim.rohrer just added that info. I didn't reformat the disk though. Even though that's a lot of work, I'm willing to do that if there's reasonable evidence that that will do anything. I'm a bit skeptical. The disk itself is probably ext4, and I haven't heard of anyone solving problems by reformatting. But could be wrong. – Evert Mar 20 '16 at 22:57
  • pondini.org/TM/FAQ.html is a very good resource for Time Machine. I would suggest formatting it as a Mac OS X Extended volume and try again. So both computers are running OS X El Capitan? – tim.rohrer Mar 20 '16 at 23:03
  • I had a similar question (found here) which was likely due to network intermittency. Is your network stable during backups? – perhapsmaybeharry Mar 21 '16 at 4:50

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