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Differential Backup:?

Q: Differential Backup:?

Short answer: A differential backup includes all the changes made since the last full backup. Explain a bit more It does not depend on other differential backups. Advantages: Smaller than a full backup, and quicker to take compared to full backups. Disadvantages: Can become larger over time as more changes accumulate between full backups. Example: If the last full backup was taken on Monday, a differential backup taken on Wednesday would include all changes since Monday. Real-world example (ShopNest) ShopNest’s SQL Server database stores customers, products, and orders. Good indexes and clear foreign keys keep checkout queries fast and safe. Say this in the interview Define — one clear sentence (the short answer above). Example — relate it to a project like ShopNest or your real work. Trade-off — when you would not use it.

Short answer: A differential backup includes all the changes made since the last full backup.

Explain a bit more

It does not depend on other differential backups. Advantages: Smaller than a full backup, and quicker to take compared to full backups. Disadvantages: Can become larger over time as more changes accumulate between full backups. Example: If the last full backup was taken on Monday, a differential backup taken on Wednesday would include all changes since Monday.

Real-world example (ShopNest)

ShopNest’s SQL Server database stores customers, products, and orders. Good indexes and clear foreign keys keep checkout queries fast and safe.

Say this in the interview

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

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