Backup & Recovery

TrueDelta: How Cove Makes Backups 60x Smaller

18 February 2026 · 0x1m3 · 6 min read

Your backup solution is probably sending far more data than it needs to. Every night, traditional backup products copy entire files that have changed — even if only a few kilobytes within those files are different. On South African bandwidth, that inefficiency costs real money.

Cove Data Protection's TrueDelta technology changes the equation entirely.

The Problem With File-Level Incremental Backup

Most backup products — Veeam, Acronis, and others — use file-level incremental backup as their default approach. The logic is straightforward: if a file has changed since the last backup, copy the whole file.

This works well enough for small files. But consider what happens with the data types that dominate enterprise environments:

- A 50 GB database where a few records changed. File-level backup copies all 50 GB. - A 10 GB Outlook PST/OST file where one email arrived. File-level backup copies all 10 GB. - A 2 GB virtual disk with a few hundred kilobytes of writes. File-level backup copies all 2 GB.

Multiply this across every server, every workstation, every night. The bandwidth and storage costs accumulate fast — and in South Africa, where connectivity is expensive and often constrained, the problem is amplified.

How TrueDelta Works

TrueDelta operates at the block level, not the file level. Instead of asking "which files changed?", TrueDelta asks "which blocks within those files changed?"

Here is the technical process:

1. Initial seed backup captures a full image of the protected system — every block on the disk. 2. On each subsequent backup, TrueDelta compares the current state of every block against the previous backup state. 3. Only the changed blocks are compressed, encrypted with AES-256, and transmitted to the cloud. 4. The cloud storage reconstructs the full recovery point by combining the base image with all subsequent block-level changes.

The result: where a file-level incremental might transfer 50 GB for that changed database, TrueDelta transfers only the few megabytes of blocks that actually changed.

The 60x Difference in Practice

Consider a real-world scenario. A company runs a 500 GB SQL Server with moderate daily transaction volume.

Metric	File-Level Incremental	TrueDelta (Block-Level)
Daily changed data (actual)	~800 MB of block changes	~800 MB of block changes
Data transferred nightly	~48 GB (changed files)	~800 MB (changed blocks)
Monthly transfer	~1.44 TB	~24 GB
Annual storage growth	~17.5 TB	~290 GB

That is the 60x difference. Same data. Same protection. A fraction of the bandwidth and storage.

Why This Matters for South African Businesses

South Africa's bandwidth economics make TrueDelta particularly valuable.

Cost reduction. A business paying per-gigabyte for cloud storage and data transfer sees an immediate and dramatic reduction in backup-related costs. Less data transferred means lower egress charges. Less data stored means lower retention costs.

Backup windows that fit. Many SA organisations still operate on connections that cannot transfer hundreds of gigabytes overnight. TrueDelta's smaller incrementals complete within practical backup windows — even on 20 Mbps lines that would choke on file-level transfers.

Cloud backup becomes viable. For organisations that dismissed cloud backup due to bandwidth constraints, TrueDelta reopens the conversation. When your nightly transfer drops from 48 GB to 800 MB, direct-to-cloud backup stops being a luxury and becomes the logical choice.

Beyond Efficiency: The Full Cove Architecture

TrueDelta is not an isolated feature. It is part of Cove Data Protection's direct-to-cloud architecture:

- No local appliances. Data goes straight from the protected system to one of 30 global data centres across 5 continents — including South African storage locations. No on-premises backup server to maintain, license, or protect. - AES-256 encryption at rest and in transit. Your data is encrypted before it leaves the source machine. - Immutable storage. Backed-up data cannot be modified or deleted by ransomware — or by anyone without proper authorisation. - Automated recovery testing on 14-day and 30-day cycles. Cove proves your backups work before you need them, with a 99%+ recovery success rate. - Broad workload support. Servers, workstations, Microsoft 365 (Exchange 6x/day, SharePoint and Teams 4x/day, OneDrive), bare-metal recovery, Hyper-V, VMware, Azure VMs, and Standby Image for instant failover.

How TrueDelta Compares

A fair comparison against established backup platforms:

Capability	Cove (TrueDelta)	Veeam	Acronis
Incremental method	Block-level (default)	File-level (CBT available for VMs)	File-level
Local appliance required	No	Yes	Optional
Cloud-native architecture	Yes	Add-on	Hybrid
Incremental size (typical)	60x smaller	Standard	Standard
SA data residency	Yes	Depends on target	Depends on target
Immutable by design	Yes	Configurable	Configurable

Cove is not trying to do everything Veeam does — it is purpose-built for efficient, cloud-first backup. For organisations that want enterprise-grade data protection without the complexity of managing on-premises backup infrastructure, TrueDelta makes the case clearly.

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See TrueDelta in Action

Smaller backups. Faster recovery. Lower costs. TrueDelta is the engine behind Cove Data Protection — and the reason OAS deploys Cove as the "Recover" pillar of our Protect, Detect, Recover methodology. With 40+ years as a trusted partner to South African businesses, we know that backup must be practical, not just theoretical.

See TrueDelta in Action →