Amazon EBS Concepts
Amazon EBS volumes provide the following:
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Off-instance storage
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Persistence beyond the lifetime of instances
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High availability and reliability
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Ability to attach to and detach from a running instance
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Exposure as a device within an instance
Amazon EBS snapshots provide the following:
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Ability to capture the current state of a volume
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Data backup
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A method for instantiating new volumes that contain the exact contents of a snapshot