The following permissions are required to back up and restore Google Cloud Storage buckets:
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storage.buckets.create
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storage.buckets.get
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storage.buckets.getIamPolicy
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storage.buckets.getObjectInsights
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storage.buckets.list
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storage.buckets.listEffectiveTags
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storage.buckets.listTagBindings
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storage.buckets.setIamPolicy
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storage.buckets.update
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storage.multipartUploads.abort
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storage.multipartUploads.create
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storage.objects.create
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storage.objects.delete
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storage.objects.get
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storage.objects.getIamPolicy
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storage.objects.list
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storage.objects.setIamPolicy
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storage.objects.update