Block-Level Backup is a backup that tracks and copies changed storage blocks instead of processing each file individually.
Simple definition
Block-Level Backup is a backup that tracks and copies changed storage blocks instead of processing each file individually. It belongs to the Backup / PRA vocabulary and is useful when reading architecture diagrams, product documentation, logs, or administration procedures.
What is it used for?
Its main purpose is to efficiently back up volumes or VMs, especially incrementally, with less data to reread. The practical value depends on the surrounding architecture, security model, and operational requirements.
How does it work?
The engine identifies used or changed blocks through snapshots, CBT, or an equivalent mechanism, then transfers only what is required.
Key points
- Scope: A backup that tracks and copies changed storage blocks instead of processing each file individually.
- Operational goal: Efficiently back up volumes or VMs, especially incrementally, with less data to reread.
- Implementation: The engine identifies used or changed blocks through snapshots, CBT, or an equivalent mechanism, then transfers only what is required.
Points to watch
A backup is reliable only if restore is tested; document RPO/RTO, retention, immutability, and chain dependencies.
In short
Block-Level Backup = a backup that tracks and copies changed storage blocks instead of processing each file individually. Use it when you need to efficiently back up volumes or VMs, especially incrementally, with less data to reread.