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I have an iMac with a Fusion drive running High Sierra. Time Machine is enabled and backs up to an external disc.

Time Machine takes daily local snapshots so that you can go back to a specific day, even if you don't plug in your backup disc every day.

Unfortunately, this feature is enabled only on laptops, as the aforelinked page says.

How do I tell Time Machine to enable it on my iMac? I plug in my external disc only once a fortnight to backup, but I'd still like to go back to a particular day's snapshot, say if I overwrote a file.

  • It used to be sudo tmutil enablelocal but this doesn't work anymore in High Sierra. – nohillside Nov 25 '17 at 14:21
  • What version of macOS? Is your iMac running pure SSD or a spinning HDD either as fusion drive or just a HDD? – bmike Nov 25 '17 at 15:56
  • @bmike High Sierra with a Fusion Drive. Sorry I forgot to include that information earlier. – Vaddadi Kartick Nov 26 '17 at 4:01
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It seems that local snapshots are enabled automatically in High Sierra.

enter image description here

The text in the red box translates to "local snapshots, as long as disk space is available".

I didn't find something from Appe on this, but this blogpost comes to the same conclusion.

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