Which of the following would a company implement in order to ensure that critical system data backups are available in case the datacenter is lost due to a natural disaster?

Snapshots are point-in-time copies of data typically stored on the same storage system as the primary data, and thus would be lost if the entire datacenter is destroyed.

E-vaulting, or electronic vaulting, is a process of securely transmitting and storing backup data offsite, often in a geographically distant data center. This ensures that even if the primary datacenter is completely destroyed by a natural disaster, the critical backup data remains safe and recoverable from the remote location.

Onsite D2D (Disk-to-Disk) refers to storing backups on a disk located within the same datacenter, making it vulnerable to the same disaster as the primary data.

Onsite D2D2T (Disk-to-Disk-to-Tape) involves moving backups from disk to tape, but implies these operations are primarily onsite, meaning the tape media would also likely be lost in a datacenter disaster unless explicitly taken offsite.