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Backup Storage Cost Calculator

Calculate cloud and offsite backup storage expenses, modeling daily incremental change deltas, monthly synthetic full snapshots, deduplication compression ratios, and ransomware immutability locks.

2.0 = 2:1 reduction (50% saved)

Calculated Cloud & Storage Breakdown

Effective Backup Storage Cost Formula

Effective GB = [Full Backup + (Days * Delta GB) + (Monthly Archives * Archive GB)] / Deduplication Ratio; Cost = Effective GB * (Storage Rate + Immutability)
  • Primary Data: Size of production active databases, VMs, and file shares.
  • Daily Change Delta: Percentage of data modified each working day (typically 2% to 5%).
  • Deduplication & Compression: Storage reduction ratio achieved by backup appliances (typically 1.5:1 to 3.0:1).
  • Immutability & Object Lock: S3 Object Lock protection against malicious ransomware deletion ($0.004/GB).

Step-by-Step Worked Example

Scenario: An enterprise protects 1,000 GB of production data with a 4% daily change rate, 30 days retention, 6 monthly snapshots, a 2.0:1 deduplication ratio, and a $0.02/GB storage rate.

Calculation Steps:

  1. Full Base Backup: 1,000 GB
  2. Daily Incrementals (30 days): 30 * (1,000 * 4%) = 1,200 GB
  3. Monthly Snapshots (6 archives): 6 * 500 GB synthetic = 3,000 GB
  4. Total Raw Data: 1,000 + 1,200 + 3,000 = 5,200 GB
  5. Effective Storage After 2:1 Dedup: 5,200 / 2.0 = 2,600 GB (2.6 TB)
  6. Total Monthly Backup Fee: 2,600 * $0.02 = $52.00/month
  7. Annual Backup Cost: $52.00 * 12 = $624.00/year
Result: Total backup storage requires 2,600 GB after deduplication, costing $52.00/month ($624.00/year) to protect 1,000 GB of production data.

How to Use This Calculator

  1. 1Enter the size of your primary production data in gigabytes.
  2. 2Input the daily data change rate delta percentage (typically 3% to 5%).
  3. 3Set your retention window for daily restore points and monthly archive snapshots.
  4. 4Adjust deduplication and compression ratios to calculate net billable cloud gigabytes.

Assumptions & Limitations

  • Deduplication efficiency depends on data type (virtual machines deduplicate well; encrypted files do not).
  • Synthetic full backups optimize incremental restore chains.

Frequently Asked Questions

What is immutable backup storage?

Immutable storage uses WORM (Write Once, Read Many) object locking. Once written, backup snapshots cannot be modified, deleted, or encrypted by anyone—even an administrator with stolen credentials—for the duration of the retention policy.

Why does backup storage grow larger than original production data?

Retaining historical versions, daily snapshots, and compliance archives for months or years means multiple generations of modified files are stored simultaneously, routinely requiring 2 to 4 times the capacity of production systems.

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