Backup data using GCP low-cost snapshots

Creating regular persistent disk snapshots to backup data, even if they’re attached to a running instances. Snapshots are a faster, more cost-effective way to back up data versus to create a full image of a disk.

Snapshots are differential, so administrator can create regular snapshots on a persistent disk much faster and at a much lower cost. Snapshots are always created based on the last successful snapshot taken.

Google Cloud Platform create snapshot

use the gcloud compute disks snapshot command:

gcloud compute disks snapshot [DISK_NAME]

Reference
Creating Persistent Disk Snapshots