Estimate backup storage needs based on data size, change rate, retention period, and backup strategy. Compare full, incremental, and differential backup approaches with cost estimates.
You might also find these calculators useful
Our Backup Size Calculator helps IT administrators and system engineers estimate storage needs for different backup strategies. Compare full, incremental, and differential backups to find the optimal balance between storage costs and recovery speed.
Backup storage requirements depend on your backup strategy, data change rate, and retention policy. Full backups copy everything each time. Incremental backups only copy changes since the last backup. Differential backups copy all changes since the last full backup. Each strategy has trade-offs between storage use and restore complexity.
Backup Size Formula
Total Storage = Full Size + (Change Rate × Retention × Data Size)Predict storage costs for cloud backup services or local infrastructure.
Compare full, incremental, and differential to optimize cost vs recovery time.
Size storage arrays and purchase appropriate capacity for backup needs.
Ensure adequate retention while managing storage growth.
Incremental backs up only changes since the last backup (any type). Differential backs up all changes since the last full backup. Incremental uses less space but needs all backups for restore; differential needs only the last full plus latest differential.
Most organizations see 2-5% daily change for general file servers, 5-15% for active databases, and 1-3% for archive data. Measure your actual change rate using backup software reports for accuracy.
Compression typically reduces backup size by 30-50% for general data. Already-compressed files (images, videos, ZIP files) see minimal benefit. Enable compression for significant storage savings.
Yes. Keep 3 copies of data, on 2 different media types, with 1 copy offsite. This protects against hardware failure, site disasters, and ransomware. Factor this into your storage calculations.
Cloud storage costs approximately $0.02-0.03 per GB/month for standard tiers. Factor in data transfer costs for initial upload and restores. Glacier/archive tiers cost less but have retrieval fees.