Create an Instance Snapshot
Creating a snapshot of an instance allows you to capture the current state of the nonpersistent boot disk used by an instance, including all customization that you may have made at the operating-system level after creating the instance.
Note:
Instance snapshots capture the state of your nonpersistent boot disk.
You can’t create an instance snapshot if your instance uses a persistent boot disk. For the steps to take a snapshot of a bootable volume, see Create a Colocated Volume Snapshot.
Next step: Register the snapshot as an image. See Register a Machine Image.