How to prevent data loss

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So the most Challenging problem we are facing is the prevent data from loss and the loss can done any type such as Virus or some other causes

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Are you concerned more about disaster recovery to ensure that you have secure backups in case something gets lost?

Or more about preventing exfiltration?   A few services to lookin to related to this?

1. Event Threat Detection (docs) Continuously monitors your organization or projects to identifies threats within your systems in near-real time including risk like extractions of data in systems like BigQuery or CloudSQL
2. Sensitive Data Protection (docs | blog) Help you monitor for sensitive data and ensure it has certain controls in place (e.g. column level policy).  
3. VPC-Service Controls (docs) Enforce a security perimeter to help reduce the risk of data exfiltration or data breach.

Hope these help.