How do you backup and restore a Cosmos DB?

Short answer: Automatic backups every 4 hours (retention 7–30 days depending on config). Restore using point-in-time restore in Azure Portal or via CLI.

Real-world example (ShopNest)

ShopNest on Azure typically uses App Service + SQL Database + Blob Storage + Application Insights for monitoring.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.