Backup Capacity Calculator
The Backup Capacity Calculator estimates how much backup storage you need based on protected data size, daily change rate, retention period, and efficiency assumptions. Choose between initial-full-only, weekly full, or monthly full backup strategies and see raw capacity, effective capacity after compression and deduplication savings, and a recommended repository size including free space buffer. Advanced options let you model secondary copy multipliers, data growth projections, and immutable retention requirements. The tool displays results in both TB and TiB and provides a detailed calculation breakdown. Presets for small business, VMware environments, large file servers, and immutable backup scenarios help you get started quickly. Results are estimation-oriented for planning purposes — actual usage depends on workload churn, vendor behaviour, and backup policies. Runs entirely in your browser.