Disaster Recovery Capacity Needs Estimator

1. Enter current protected capacity
Use the current workload size in terabytes before the extra overhead factor.

2. Set monthly data growth
Enter the expected compound growth rate for the protected workload.

3. Enter the overhead factor
Use a percentage that represents extra capacity required by your design, such as replication, snapshots, metadata, or safety margin.

4. Choose the planning horizon
Enter the number of months to project.

5. Review required capacity
Use the main result as a planning estimate and the breakdown to see how growth and overhead contribute.

Required capacity = Current capacity × (1 + Monthly growth)^Months × (1 + Overhead factor)

Projected base capacity is calculated before overhead. Added overhead capacity equals projected base capacity × overhead factor. Percentages are converted to decimals. The model assumes compound monthly growth and a single overhead factor applied at the end of the horizon.

What the result means

The result combines projected workload growth with the selected additional capacity allowance.

Use multiple scenarios when growth, retention, compression, replication, or recovery design is uncertain.

Given: Current protected capacity = 80 TB; monthly growth = 3%; overhead factor = 20%; horizon = 12 months.

Calculation: Projected base = 80 × 1.03^12 = 114.06 TB. Overhead = 114.06 × 0.20 = 22.81 TB. Required capacity = 136.87 TB.

Result: Plan for about 136.9 TB under these assumptions, roughly 56.9 TB above current protected capacity.