How This Calculator Works
Use this backup storage tool for quick estimation, comparison, and planning intent while keeping formula assumptions visible.
Use the backup storage calculator to estimate how much storage is needed for a full backup plus retained daily changes.
The estimate starts with a full backup, adds retained daily changed data, multiplies by backup copies, then applies compression savings.
Formula
Storage = (source data + source data x daily change rate x retention days) x copies x compression factor.
Example Calculation
500 GB with 3% daily change for 30 days and 20% compression needs about 760 GB for one copy.
When to Use This Calculator
- Plan backup storage
- Estimate cloud backup costs
- Compare retention policies
Practical Scenarios
- Use the Backup Storage Calculator to plan backup storage while comparing at least one conservative and one higher-cost scenario.
- Use the Backup Storage Calculator to estimate cloud backup costs while comparing at least one conservative and one higher-cost scenario.
- Use the Backup Storage Calculator to compare retention policies while comparing at least one conservative and one higher-cost scenario.
Tips
- Databases and media compress differently
- Keep one offsite copy
- Retention policy often drives storage more than source size
Common Mistakes
- Counting only source data
- Ignoring daily change rate
- Forgetting multiple backup copies
- Using a best-case input when a realistic range would be safer.
- Forgetting fees, taxes, inflation, usage changes, or other hidden costs where they apply.
Assumptions and Limitations
The Backup Storage Calculator is most accurate when the inputs match current real-world numbers and when you review the formula, assumptions, and related calculators before acting.
- Provider pricing, runtime overhead, compression, caching, hardware limits, and production traffic can change final requirements.
- The result is a technical planning estimate, not a guarantee of performance or cost.
- Verify against current vendor documentation before committing to infrastructure or hardware.
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