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Amazon Elastic Compute Cloud
User Guide for Windows Instances

Creating an Amazon EBS Snapshot

A point-in-time snapshot of an EBS volume, can be used as a baseline for new volumes or for data backup. If you make periodic snapshots of a volume, the snapshots are incremental—only the blocks on the device that have changed after your last snapshot are saved in the new snapshot. Even though snapshots are saved incrementally, the snapshot deletion process is designed so that you need to retain only the most recent snapshot in order to restore the entire volume.

Snapshots occur asynchronously; the point-in-time snapshot is created immediately, but the status of the snapshot is pending until the snapshot is complete (when all of the modified blocks have been transferred to Amazon S3), which can take several hours for large initial snapshots or subsequent snapshots where many blocks have changed. While it is completing, an in-progress snapshot is not affected by ongoing reads and writes to the volume.

Important

Although you can take a snapshot of a volume while a previous snapshot of that volume is in the pending status, having multiple pending snapshots of a volume may result in reduced volume performance until the snapshots complete.

There is a limit of five pending snapshots for a single gp2, io1, or Magnetic volume, and one pending snapshot for a single st1 or sc1 volume. If you receive a ConcurrentSnapshotLimitExceeded error while trying to create multiple concurrent snapshots of the same volume, wait for one or more of the pending snapshots to complete before creating another snapshot of that volume.

Snapshots that are taken from encrypted volumes are automatically encrypted. Volumes that are created from encrypted snapshots are also automatically encrypted. The data in your encrypted volumes and any associated snapshots is protected both at rest and in motion. For more information, see Amazon EBS Encryption.

By default, only you can create volumes from snapshots that you own. However, you can share your unencrypted snapshots with specific AWS accounts, or you can share them with the entire AWS community by making them public. For more information, see Sharing an Amazon EBS Snapshot.

You can share an encrypted snapshot only with specific AWS accounts. For others to use your shared, encrypted snapshot, you must also share the CMK key that was used to encrypt it. Users with access to your encrypted snapshot must create their own personal copy of it and then use that copy to restore the volume. Your copy of a shared, encrypted snapshot can also be re-encrypted with a different key. For more information, see Sharing an Amazon EBS Snapshot.

When a snapshot is created from a volume with an AWS Marketplace product code, the product code is propagated to the snapshot.

You can take a snapshot of an attached volume that is in use. However, snapshots only capture data that has been written to your Amazon EBS volume at the time the snapshot command is issued. This might exclude any data that has been cached by any applications or the operating system. If you can pause any file writes to the volume long enough to take a snapshot, your snapshot should be complete. However, if you can't pause all file writes to the volume, you should unmount the volume from within the instance, issue the snapshot command, and then remount the volume to ensure a consistent and complete snapshot. You can remount and use your volume while the snapshot status is pending.

To create a snapshot for an Amazon EBS volume that serves as a root device, you should stop the instance before taking the snapshot.

To unmount the volume in Windows, open Disk Management, right-click the volume to unmount, and select Change Drive Letter and Path. Select the mount point to remove, and then click Remove.

After you've created a snapshot, you can tag it to help you manage it later. For example, you can add tags describing the original volume from which the snapshot was created, or the device name that was used to attach the original volume to an instance. For more information, see Tagging Your Amazon EC2 Resources.

To create a snapshot using the console

  1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

  2. Choose Snapshots in the navigation pane.

  3. Choose Create Snapshot.

  4. In the Create Snapshot dialog box, select the volume to create a snapshot for, and then choose Create.

To create a snapshot using the command line

You can use one of the following commands. For more information about these command line interfaces, see Accessing Amazon EC2.

Note

Using Systems Manager Run Command, you can take application-consistent snapshots of all Amazon Elastic Block Store (Amazon EBS) volumes attached to your Amazon EC2 Windows instances. The snapshot process uses the Windows Volume Shadow Copy Service (VSS) to take image-level backups of VSS-aware applications, including data from pending transactions between these applications and the disk. Furthermore, you don't need to shut down your instances or disconnect them when you need to back up all attached volumes. For more information, see Using Run Command to Take VSS-Enabled Snapshots of EBS Volumes in the AWS Systems Manager User Guide.