Backup Storage Calculator

Calculate backup storage requirements from source data volume, daily change rate, retention policy, and compression ratio using a GFS backup model.

Source data (GB)

Daily change rate (%)

Retention period (days)

Compression ratio

Tab to move between fields

Total storage (TB)

1.83

Total storage (GB)1,875

Incremental backups (GB)375

Full backups (GB)1,500

Peak throughput (Mbps)142.2

Avg daily transfer (GB)25

Est. monthly cost ($)$39.88

How to Use This Calculator

Enter source data (GB) and daily change rate (%) -- typical: 3-5% for databases, 1-2% for files.
Set retention period (days) and compression ratio -- 2:1 for text, 1.1:1 for already-compressed data.
Review total storage needed in TB, incremental backup storage per day, and full backup size.
Add 30% overhead to storage estimates for deduplication metadata, indexes, and catalog data.
Plan for offsite or cloud replication -- 3-2-1 rule: 3 copies, 2 media types, 1 offsite.

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