Tutorials System Design Tutorial
Data Replication for Storage — Complete Guide
Data Replication for Storage — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of System Design Tutorial on Toolliyo Academy.
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System Design Tutorial · Lesson 37 of 100
Data Replication for Storage
Basics ✓ → Scale → Interview
Scale · 2 — Distributed · ~6 min · Module 4: Caching and Storage
What is this?
Storage replication copies blobs/blocks across disks, racks, or regions for durability and read locality.
Why should you care?
Losing ShopNest invoice PDFs to one disk failure is unacceptable.
See it live — copy this example
Sketch the architecture on paper. These lessons focus on concepts and trade-offs.
Object store: 3× replicate within region (provider-managed)
Cross-region replica for DR invoices
RPO: async region copy may lag minutes
App reads nearest region replica for catalogsRun Example »
This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.
What happened?
- Providers replicate under the hood; you still choose cross-region DR and understand RPO.
- Durability is not the same as application-level backup of metadata.
Practice next
- Enable cross-region replication for critical ShopNest invoices.
- State RPO for media vs ledger DB separately.
- Test restore of a deleted object version.
- Turn on object versioning for invoices.
- Exclude disposable temp uploads from CRR.
Remember
Replication raises durability. Know regional RPO. Versioning helps recover from deletes.
Invoice DR copy
ShopNest replicates invoice bucket to a second region.
Outcome: Region loss does not erase tax documents.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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