Backup Storage Calculator

Plan backup budgets with retention and redundancy controls. Model snapshots, restores, compression, and future growth. See costs clearly before choosing storage tiers today wisely.

Calculator Inputs

The page stays single column, while the form fields adapt to large, small, and mobile screens.

Reset
Protected primary data before backup copies.
Estimated daily changed blocks or files.
Days of daily changes kept online.
Retained weekly full backups.
Long-term monthly backups kept accessible.
Annual copies for compliance or legal hold.
Use 1.8 for 1.8x compression.
Use 1.4 for 1.4x deduplication.
Metadata, index, catalog, and versioning overhead.
Reserved headroom for spikes and policy changes.
Replica count for durable backup storage.
Use 2 for mirrored second-region billing.
Yearly growth used for forward projections.
Projection period for future monthly spend.
Monthly storage unit price in dollars.
Applied to expected monthly restore volume.
Share of source data restored each month.
Percent of restored data leaving the provider.
Outbound transfer price during restores.
Request, lifecycle, or catalog fees.

Example Data Table

Scenario Source TB Daily Change Retention Weekly Monthly Yearly Comp. Dedupe Copies Approx. Billed TB Approx. Monthly Total
Small SaaS 2 2% 14 days 2 1 0 2.0x 1.5x 2 6.59 $160.83
Media Platform 8 5% 30 days 4 6 1 1.6x 1.3x 3 179.91 $3,900.24
Compliance Archive 15 1.5% 7 days 1 12 2 2.2x 1.7x 2 149.21 $3,254.29

These sample outputs use the calculator logic shown below. Vendor pricing tiers, minimums, and request billing can change the final invoice.

Formula Used

Daily Change GB = Source Data GB × (Daily Change % ÷ 100)
Pre-Optimization GB = Source GB + Daily Pool + Weekly Fulls + Monthly Archives + Yearly Archives
Optimization Factor = Compression Ratio × Dedupe Ratio
Base Physical GB = Pre-Optimization GB ÷ Optimization Factor
Protected Storage GB = Base Physical GB + Overhead + Safety Buffer
Billable Storage GB = Protected Storage GB × Redundancy Copies × Geo-Replication Multiplier
Monthly Total = Storage Cost + Retrieval Cost + Egress Cost + API Charges
This model assumes ratios reduce the total protected pool evenly. It is an estimation tool, not a replacement for provider invoices or archival class billing rules.

How to Use This Calculator

  1. Enter the logical source data size you need protected.
  2. Add change rate, retention days, and backup copy counts.
  3. Set compression, dedupe, overhead, and safety buffer assumptions.
  4. Choose redundancy, geo-replication, and growth projection values.
  5. Enter storage, retrieval, egress, and API pricing inputs.
  6. Press the calculate button to show totals, tables, and the Plotly graph above the form.

FAQs

1. What does this calculator estimate?

It estimates protected backup capacity, replica-adjusted billable storage, likely monthly charges, projected future spend, and restore-related retrieval or egress costs.

2. Why do retention days matter so much?

Longer retention stores more changed blocks or files. Even modest daily change rates can grow rapidly when many days of incremental history remain online.

3. How are compression and dedupe applied?

The tool multiplies both ratios into one optimization factor. It then divides the raw protected pool by that factor to estimate physical storage used.

4. What is the geo-replication multiplier?

It models extra billing when backup data is mirrored to another region. Use 1 for no extra geographic copy, or 2 when a second billed region exists.

5. Does the model include restore charges?

Yes. It estimates retrieval fees from restored volume and optional egress costs for restored data that leaves the cloud provider network.

6. Why add a safety buffer?

A buffer helps cover catalog growth, retention changes, sudden data expansion, and temporary copy spikes during migration, testing, or policy updates.

7. Is this suitable for all vendors?

It is broadly useful, but providers bill differently. Tiered pricing, minimum object sizes, request classes, and early deletion rules may change actual invoices.

8. How should I validate the result?

Compare the estimate with recent storage reports, restore logs, retention policies, and provider pricing pages. Then adjust the assumptions until they match reality.

Related Calculators

Database Size CalculatorCloud Database CostQuery Cost EstimatorReplication Cost CalculatorRead Write CostIOPS Cost CalculatorArchive Storage CostHigh Availability CostMulti Region CostProvisioned Throughput Cost

Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.