# Our storage configuration

- [Our three replicas: S3, Glacier, and Azure](/storage-service/wellcome-specific-information/our-storage-configuration/replica-configuration.md)
- [Using multiple storage tiers for cost-efficiency (A/V, TIFFs)](/storage-service/wellcome-specific-information/our-storage-configuration/using-multiple-storage-tiers-for-cost-efficiency-a-v-tiffs.md)
- [Small fluctuations in our storage bill](/storage-service/wellcome-specific-information/our-storage-configuration/small-fluctuations-in-our-storage-bill.md)
- [Delete protection on the production storage service](/storage-service/wellcome-specific-information/our-storage-configuration/delete-protection-on-the-production-storage-service.md)