The following permissions are required to back up Google Cloud Storage buckets:
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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.objects.get
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storage.objects.getIamPolicy
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storage.objects.list