Backup Storage Calculator
Estimate how much storage your backups actually need — using GFS rotation, compression, and deduplication — before you buy hardware or commit to a cloud tier.
% of source data modified per day — same blocks may change repeatedly, not cumulative growth.
Daily incrementals + weekly, monthly and yearly full backups.
What Is the 3-2-1 Backup Rule?
The 3-2-1 rule is the industry-standard baseline for backup strategy: keep 3 copies of your data, on 2 different types of storage, with 1 copy stored off-site. This protects against hardware failure (covered by the local copy), site-level disaster (covered by the off-site copy), and simultaneous failure of both local copies (covered by the second local copy).
For organisations in Oman, the off-site copy is typically a cloud backup tier using Acronis, Veeam Cloud Connect, or AWS S3 — providing geographic separation without the cost of a secondary data centre.
Understanding GFS Backup Rotation
Grandfather-Father-Son (GFS) rotation is the most widely used backup scheme. Daily (Son) backups run as incrementals — capturing only changed data — and are kept for 7–14 days. Weekly (Father) full backups are retained for 4–8 weeks. Monthly (Grandfather) fulls are kept for 12 months or more, and yearly fulls may be retained for compliance or audit purposes.
GFS balances storage efficiency with recovery flexibility: you can restore to any day in the past week, any week in the past month, and any month in the past year — without the cost of storing a full backup for every single day.
Compression and Deduplication: How Much Do They Save?
Compression reduces individual file size by encoding redundant patterns within a file — typically achieving 30–50% reduction for databases and documents. Deduplication identifies identical data blocks across multiple backup jobs and stores them only once — particularly effective for VM backups where multiple VMs share the same OS image.
Combined, modern backup platforms like Veeam and Acronis can achieve 2:1 to 4:1 storage ratios for mixed workloads — meaning 1 TB of source data may only need 250–500 GB of backup storage. Media files and already-compressed archives see minimal benefit from either technique.
Backup Storage Sizing for Oman Businesses
Organisations in Oman face specific considerations: limited internet bandwidth on some sites makes full daily cloud uploads impractical for large datasets — initial seeding via physical media and local-first replication is often more practical. Many businesses in Muscat use on-site NAS appliances (Synology, QNAP, or dedicated Veeam repositories) for the primary local tier, with cloud backup as the off-site copy.
Decoding IT helps organisations across Oman design right-sized backup architectures using Veeam and Acronis — matching retention policy, storage hardware, and cloud tier to actual recovery requirements, not vendor defaults.
Get Your Backup Architecture Right
Storage size is only part of the picture. Recovery time, recovery point objectives, and the right balance of local vs. cloud backup all depend on your specific environment and compliance requirements. Decoding IT offers a free backup architecture review — we size your storage correctly and design a solution that actually meets your RTO and RPO.