Generally available: To ensure data consistency when backing up multiple disks,

## Feature Feature **Generally available**: To ensure data consistency when backing up multiple disks, you can use consistency groups of instant snapshots to back up a group of disks at the same point in time. For more information, see[About instant snapshots](https://cloud.google.com/compute/docs/disks/instant-snapshots). ## Feature Feature **Preview**: You can specify a 120-second preemption notice duration while creating Spot VMs. Use this feature for workloads on Spot VMs where you want up to an additional 120 seconds for handling preemption. If you want to migrate existing Spot VMs workloads, make sure you update your workload to handle preemption outside of a shutdown script and test preemption. For more information, see[Spot VMs](https://cloud.google.com/compute/docs/instances/spot#preemption-notice-duration)and [Create and use Spot VMs](https://cloud.google.com/compute/docs/instances/create-use-spot). ## Feature Feature **Generally available**: You can rotate the customer-managed encryption key (CMEK) used to encrypt a disk, standard snapshot, or archive snapshot to a new key version without downtime. **Generally available**: You can change the CMEK used to encrypt a disk, standard snapshot, or archive snapshot to a different key without downtime. For more information, see[Rotate the CMEK for a disk or standard snapshot](https://cloud.google.com/compute/docs/disks/customer-managed-encryption#rotate%5Fencryption)and[Change the CMEK for a disk or standard snapshot](https://cloud.google.com/compute/docs/disks/customer-managed-encryption#change-key).