Backup Size Calculator
Calculate total backup storage requirements based on data size, daily change rate, retention period, and backup type (full, incremental, or differential).
How to Use the Backup Size Calculator
- Enter your total data size in GB.
- Enter daily data change percentage.
- Enter retention period in days.
- Select backup type and click Calculate.
Cas d'utilisation
- •Sizing backup storage for on-premises NAS or tape.
- •Estimating cloud backup storage costs.
- •Planning backup retention policies.
- •Comparing backup strategies for cost optimization.
Formule
Full: size × days. Incremental: size + size×change×(days−1). Differential: size + size×change×days×(days−1)/2.
Questions fréquemment posées
What is an incremental backup?
Incremental backups store only changes since the last backup, saving space but requiring all backups for restore.
What is a differential backup?
Differential backups store changes since the last full backup — faster to restore than incremental but uses more space.
How much space do I need for 30-day retention?
Use this calculator with your data size and daily change rate to get the exact storage requirement.