If the OS doesn't support APFS, we would copy to a non-APFS disk...? And if the OS doesn't support APFS (eg 10.12) we won't.
If the firmware hasn't been updated for boot-time APFS support, we don't know - that capability isn't exposed. But installing the OS (rather then restoring) will ensure that the firmware is updated...these things are distributed with installers.
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--Dave Nanian
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