The planning lab / Backup footprint
Backup Storage Calculator
Work from your own numbers. See the assumptions behind every result.
The calculation, explained
Transparent by design.
Source GB × (retained full backups + retained incremental backups × changed data % ÷ 100) × stored size % ÷ 100 × independent copies. Assumes each incremental stores the stated fraction of source data. Compression, deduplication, and retention behavior vary by system.
Explore all four calculators