A team wants a recovery point for a persistent boot disk before applying an operating system patch, and it wants to create a new disk from that point later if needed. Which Compute Engine resource fits?
Show answer and explanation
Answer: C
A disk snapshot records the data on a persistent disk at a point in time. You can use it to restore data or to create a new disk in the same or another zone. Later snapshots of the same disk are incremental, so only blocks changed since the previous snapshot add storage cost. A snapshot is a copy of disk contents, which makes it the right tool before a risky change.
Why the other options are wrong
- A. Project metadata is key-value configuration for the project and its VMs. It holds no disk data, so it cannot restore or clone a boot disk.
- B. Cloud Logging stores log entries, not block-level copies of disks. Exported logs cannot be turned into a bootable or attachable disk.
- D. An instance template defines a configuration for new VMs, such as machine type and disks. It does not hold the data currently stored on the disk.