Interesting! So, you’d still back up your full cloud storage elsewhere (Backblaze has been mentioned by other users), even though your cloud storage provider does backups themselves (e.g. Hetzner claims to do several backups every day)?
Anything I'm only keeping for convenience or sending cloudwards for transfer/sharing purposes, doesn't need the extra protection. Though it sometimes gets it as errors in that direction are better than risking failing not-safe with other data.