Create snapshots for multiple cloud disks simultaneously by using a snapshot consistency group to back up data-Elastic Compute Service(ECS)-阿里云帮助中心

Create simultaneous snapshots for multiple cloud disks across ECS instances in one zone, ensuring point-in-time and crash consistency.

Usage notes

Note the following before creating a snapshot consistency group:

Item	Description
Performance impact	Cloud disk I/O may jitter (up to 10%) during the first few seconds of snapshot creation. Performance normalizes after the upload progress appears in the Progress column on the Snapshots page of the ECS console.
Billing	Creating a snapshot-consistent group is free. However, you incur storage fees for the snapshots in the group, based on snapshot size and retention period. See Snapshot billing.
Limitations	Only ESSD series cloud disks (ESSD, ESSD AutoPL, ESSD Entry, and Regional ESSD) support snapshot consistency groups, and the disks must not have multi-attach enabled. Important Regional ESSDs can be included in a snapshot consistency group only with other Regional ESSDs. All cloud disks in a snapshot consistency group must be in the same zone. Snapshots created by a snapshot consistency group are retained permanently. Custom retention periods are not supported. A snapshot consistency group can include disks from multiple ECS instances. Maximum: 128 disks and 256 TiB total capacity per group. Concurrent quota: Each cloud disk supports up to 10 ongoing snapshot tasks (including manual snapshots, automatic snapshots, and consistency group snapshots). Disks that reach this quota cannot be selected.

See also the usage notes in Create a snapshot for a disk.

The snapshot service is enabled.
ECS instances are in the Running or Stopped state, and cloud disks are in the In Use state.

Go to ECS console - snapshot consistency group.
In the upper-left corner of the page, select a region and resource group.
On the Snapshot-consistent Groups tab, click Create Snapshot-consistent Group.

In the Create Snapshot dialog box, configure the following parameters.

Parameter		Description
Resource Types		By default, Instance is selected. Select cloud disks from one or more instances to create a snapshot consistency group with data consistency. Note You can also set Resource Types to Disks to create a snapshot for a single cloud disk. See Create a snapshot for a disk.
Select Instances		Select the ECS instances to include in the snapshot consistency group.
Select Disks		Select cloud disks to include in the snapshot consistency group. Note Only ESSD, ESSD AutoPL, ESSD Entry, and Regional ESSD disks are supported. Regional ESSDs can only be grouped with other Regional ESSDs.
Snapshot consistency group name		The snapshot consistency group name.
(Optional) Advanced Settings	Application-consistent Snapshot	Enable Application-consistent Snapshot: Disabled by default. Select to enable application-consistent snapshots. Note Enable this for strict data consistency requirements. Application-consistent snapshots ensure data integrity within applications. See Create an application-consistent snapshot. See Limitations of this feature.
	Description	A description to help identify and manage the group.
	Tags	Key-value pairs to categorize and manage the group.

Click OK.
(Optional) View the group in the snapshot consistency group list, or click the group ID to see its snapshots.

Related API operations:
- CreateSnapshotGroup: Creates a snapshot consistency group.
- DescribeSnapshotGroups: Queries snapshot consistency group details.
- ModifySnapshotGroup: Modifies a snapshot consistency group.
After creating a snapshot consistency group, you can:
- Roll back disks by using a snapshot consistency group.
- Use individual snapshots in the group for:
To reduce storage costs, periodically delete snapshot consistency groups and their snapshots when no longer needed.