Irregular Time Machine backups are one of Sierra’s great mysteries. It now looks as if they might have been fixed in 10.12.4.
Schedule a periodic task as a Launch Agent. How close to the expected time does macOS actually run it?
When Time Machine seems to take a long time preparing the next backup, or gets stuck, here is how to diagnose and deal with it.
Why was my Mac still preparing a backup 20 minutes after it should have been completed? And what is a ‘deep event scan’?
Two major tools are available to help you deal with problems. Here’s how to use them to best effect.
Is Time Machine becoming erratic? A simple diagnostic process can establish what the problem is, and how to deal with it.
macOS Sierra doesn’t run periodic backups using a simple mechanism. Here’s the story in full detail.