Backup Storage Cost Calculator

About the Backup Storage Cost Calculator

Cloud backup storage is essential for data protection, but costs can surprise you when factoring in retention policies and restore fees. Storage rates vary by tier: S3 Standard at $0.023/GB, S3 Glacier at $0.004/GB, and Glacier Deep Archive at $0.00099/GB. However, restore costs can be steep—Glacier restores cost $0.01–$0.03/GB plus expedited fees.

Retention policies significantly impact total cost. Keeping 30 daily backups, 12 monthly backups, and 5 yearly backups of a 1 TB database can accumulate 47 TB of backup data, costing $188/month even at Glacier rates. Lifecycle policies that purge old backups are critical.

This calculator estimates the monthly cost of backup storage based on total data size, per-GB storage rates, and restoration costs. Use it to optimize your retention strategy and choose the right storage tier for your recovery time objectives.

When This Page Helps

Backup costs often grow 10–50x beyond the source data size due to retention policies and daily snapshots. Without careful planning, backup storage can become one of your largest cloud expenses. This calculator helps you model the real cost of your retention strategy.

How to Use the Inputs

1. Enter the total backup data size in GB.
2. Set the per-GB monthly storage rate for your chosen tier.
3. Enter the expected monthly restore volume in GB.
4. Set the per-GB restore cost for your storage tier.
5. Review the total monthly backup cost.

Example Calculation

Tips & Best Practices

• Use S3 Glacier for backups older than 30 days; Deep Archive for older than 90 days.
• Implement lifecycle policies to automatically transition backups between storage tiers.
• Test restores monthly to verify backup integrity; budget for the restore costs.
• Use incremental backups (changed blocks only) to reduce daily backup storage by 80–95%.
• EBS snapshots are incremental by default; only changed blocks are stored.
• Set up S3 Object Lock for ransomware protection—immutable backups cannot be deleted.

Backup Storage Tier Comparison

S3 Standard: $0.023/GB, instant access, free retrieval. S3 Infrequent Access: $0.0125/GB, $0.01/GB retrieval. S3 Glacier Instant Retrieval: $0.004/GB, millisecond access, $0.03/GB retrieval. S3 Glacier Flexible: $0.0036/GB, minutes to hours retrieval. S3 Glacier Deep Archive: $0.00099/GB, 12–48 hour retrieval. Choose based on your RTO requirements.

Backup Cost Optimization

The biggest wins come from: incremental backups (90–95% less daily storage), deduplication (20–50% reduction in total storage), lifecycle policies (auto-tier to Glacier after 30 days), and retention pruning (delete backups beyond policy requirements). Combined, these can reduce backup costs by 70–85%.

Cross-Region Backup Strategy

For disaster recovery, replicate backups to a second region. Cross-region replication costs $0.02/GB for the transfer plus storage in the destination region. For a 5 TB backup set, this adds roughly $200/month total for true geographic redundancy. Consider this the insurance premium for your data.

Frequently Asked Questions

• What is the cheapest backup storage option?

  S3 Glacier Deep Archive at $0.00099/GB/month ($1.01/TB) is the cheapest. However, restores take 12–48 hours and cost $0.02/GB. Only use Deep Archive for compliance archives you rarely need to access. For operational backups, Glacier ($0.004/GB) is a better balance.

• How much do restores cost?

  S3 Standard: free retrieval, only data transfer charges. Glacier: $0.01/GB (standard, 3–5 hours), $0.03/GB (expedited, 1–5 minutes), $0.0025/GB (bulk, 5–12 hours). Glacier Deep Archive: $0.02/GB (standard, 12 hours), $0.05/GB (bulk, 48 hours).

• How long should I retain backups?

  Common policy: daily backups for 30 days, weekly for 12 weeks, monthly for 12 months, yearly for 3–7 years. Regulatory requirements may mandate longer: SOX requires 7 years, HIPAA requires 6 years, GDPR has no minimum but requires documented policy.

• Should I use AWS Backup or roll my own?

  AWS Backup centralizes backup management for EC2, RDS, EFS, DynamoDB, and more. It adds no cost beyond the underlying storage ($0.05/GB for warm, $0.01/GB for cold). The operational simplicity of a single backup dashboard justifies it for most organizations.

• What is incremental backup?

  After the initial full backup, incremental backups only store changed data blocks. If 5% of a 1 TB database changes daily, the incremental backup is only 50 GB instead of 1 TB. Over 30 days: 1 TB full + 30 × 50 GB incremental = 2.5 TB vs 30 TB for daily full backups.

• How do I protect backups from ransomware?

  Enable S3 Object Lock with Governance or Compliance mode to make backups immutable. Use separate AWS accounts for backup storage (air-gapped). Enable MFA Delete on S3 buckets. Regularly test restores to verify backup integrity. These measures prevent attackers from deleting or encrypting your backups.