EBS Snapshots:

  • Snapshots are point-in-time backups of EBS volumes that are stored in S3.

Snapshot Properties:

  • Snapshots are incremental in nature.
  • A snapshot only stores the changes since the most recent snapshot, thus reducing cost (by only having to pay for storage for the "incremental changes" between snapshots).
  • However, if the "original" snapshot is deleted, all data is still available in all the other snapshots.
  • Even though snapshot storage only charges you for the amount of incremental data in each snapshot, all prior data is still there.
  • Snapshots can be used to create fully restored EBS volumes.
  • The first snapshot will be charged for ALL the data that is currently on the EBS volume.

A few other important snapshot notes:

  • Frequent snapshots of your data increases data durability - so highly recommended.
  • When a snapshot is being taken against the EBS volume, it can degrade performance so snapshots should occur during non-production or non-peak load hours.

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