According to this link: https://docs.aws.amazon.com/aws-backup/latest/devguide/multi-volume-crash-consistent.html
By default, AWS Backup creates crash-consistent backups of Amazon EBS volumes that are attached to an Amazon EC2 instance. Crash consistency means that the snapshots for every Amazon EBS volume attached to the same Amazon EC2 instance are taken at the exact same moment. You no longer have to stop your instances or coordinate between multiple Amazon EBS volumes to ensure crash-consistency of your application state.
Since multi-volume, crash-consistent snapshots are a default AWS Backup functionality, you don’t need to do anything different to use this feature.
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