Google Cloud Nightscout » Why have I been charged for Storage PD Snapshot?
Snapshots are not free, and their use incurs costs. You can review the specific costs associated with snapshots on Google Cloud’s pricing page.
To minimize expenses, delete your snapshots as soon as you no longer need them.
Delete your snapshot as soon as you don’t need it any longer to minimize cost.
If you need to investigate why you’ve been charged, the most effective way is to create a cost table in your Google Cloud account. This will help you identify and track the charges associated with your snapshots and other resources.