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Consider the scenario of restoring a backup taken on an HEIF/HEVC capable device (e.g. the iPhone 7 or newer) to an older device (e.g. an iPhone 6s, running iOS 11).

Will images and videos taken on the new device and accessed on the old one be:

  • Not restored at all?
  • Restored, but not displayable (i.e. taking up space, accessible for sharing/uploading etc., but not shown in the gallery)?
  • Be fully compatible, and displayed/decoded in software?

Is there a difference between images and videos? (I could imagine that images are decoded in software on older devices, for example.)

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  • I can answer your question in the title for HEIF/HEVC, but I can't say for sure what will happen when you restore.
    – oa-
    Commented Nov 21, 2017 at 14:02

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There wouldn't be a problem with that. The older iPhone would be able to convert the image back to a readable format.

More info here.

Edit: This will be an issue if trying to view the videos on a mid-2014 MacBook Pro or older. There is ways around it, but only the 2015+ editions can automatically convert them. I have recently found this out while trying to view videos from my iPhone 8 on my mid-2014 MBP.

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