A company is replacing its off-site tape rotation with a cloud backup service. Management expects that a full restore of a 4 TB file server must still meet the existing three-hour recovery time objective (RTO) when the data is brought back to the on-premises datacenter. Which characteristic of the cloud solution will have the greatest direct impact on whether the RTO can be met during a large-scale restore?
Whether the backup objects are encrypted at rest with AES-256 keys managed by the provider
The maximum sustained download bandwidth available between the cloud provider's region and the datacenter
The provider's advertised object-storage durability rating (for example, 11 nines)
The use of multi-region replication that stores the backups in three availability zones
Restoring several terabytes of data from a cloud repository requires moving the backup set across the WAN. The speed of that transfer is primarily limited by the sustained download throughput between the cloud region and the recovery site. If the link cannot deliver roughly 370 MB/s (≈3 Gb/s) for three hours, the restore will overrun the RTO no matter how durable, encrypted, or geographically redundant the storage is. High durability, server-side encryption, and cross-region replication protect the data, but they do not significantly accelerate the time it takes to copy the backup back on-premises.
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