You need to create a backup of a critical Compute Engine instance's boot disk before performing a major OS upgrade. You want to ensure that if the upgrade fails, you can quickly restore the disk or create a new instance from the backup.

Which TWO statements about disk snapshots and custom images are correct? (Select TWO)

In Compute Engine, Snapshots are used for backing up data on Persistent Disks. They are incremental, meaning the first snapshot is a full copy, but subsequent snapshots only store the blocks that have changed, saving time and storage costs. Custom Images, on the other hand, are typically created from a disk or a snapshot and are optimized to be used as bootable templates for creating new instances (e.g., in an Instance Template for a MIG). Snapshots can be taken while the VM is running, and they are available across regions.