Amazon Elastic Block Store (EBS) is a block-based storage system that provides a “virtual hard
disk in the cloud”. You can back up your EBS volumes using snapshots which are point-in-time
copies of the data.
Availability Zones are part of the AWS Global Infrastructure. AZs can be used for high
availability and fault tolerance as you can architect your applications to be spread across
them. However, they are not a backup solution.
The Amazon Elastic File System (EFS) provides file-based storage that you access using the NFS v2
protocol. This is storage service but not a backup service. You can backup EFS using the AWS
Backup service or using EFS-to-EFS backup.
Amazon Route 53 provides a DNS service and an Alias record is a type of record that can map a
public domain name to an AWS service target.