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Backup Window Calculator

Estimate full and incremental backup times and storage for one full backup plus daily changes.

Local processing

This tool processes your input in your browser.

[IN] Backup assumptions

Decimal units: 1 TB = 1,000 GB.

Percentage of the full dataset copied each day.

Must be greater than zero.

Accounts for protocol overhead, storage speed and congestion.

Kept alongside one full backup.

Extra capacity for metadata and operational headroom.

[OUT] Time & capacity

Full backup time13h 53mAt the selected effective throughput
Daily incremental time41m 40s250 GB per day
Destination storage12.5 TBOne full backup + retained incrementals
Recommended capacity15 TBIncludes 20% extra capacity

All sizes use decimal units. 1 Gbps = 125 MB/s before the effective-throughput adjustment. Zero daily changes require no incremental transfer.

Planning estimate
Assumes one full backup and the selected number of daily incrementals. Compression, deduplication, concurrent jobs and additional full backups are not included. Check these assumptions against your backup policy.

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