Backup & Restore — Complete Guide
Backup & Restore — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of SQL Server Tutorial on Toolliyo Academy.
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SQL Server Tutorial · Lesson 76 of 100
Backup & Restore
SQL basics ✓ → Queries ✓ → Advanced
Advanced · 3 — Procedures · ~10 min · SQL — Security & High Availability
What is this?
Backups copy database data/log so you can restore after failure. Full, differential, and log backups form a chain for point-in-time recovery.
Why should you care?
No backup = no business after ransomware or bad deploy.
See it live — copy this example
Run in SQL Server Management Studio (SSMS) or Azure Data Studio.
BACKUP DATABASE DataVerse
TO DISK = N'C:\Temp\DataVerse_full.bak'
WITH INIT, COMPRESSION, STATS = 10;
RESTORE VERIFYONLY FROM DISK = N'C:\Temp\DataVerse_full.bak';
-- RESTORE DATABASE DataVerse FROM DISK = N'C:\Temp\DataVerse_full.bak' WITH REPLACE; -- carefulWhat happened?
- BACKUP DATABASE writes a full backup.
- RESTORE VERIFYONLY checks readability without overwriting.
- Use a real folder that exists and that SQL Server can write to.
Practice next
- Create C:\Temp if needed and grant service account write access.
- Run full backup with compression.
- VERIFYONLY the bak file.
- BACKUP LOG DataVerse TO DISK = N'C:\Temp\DataVerse.trn';
- Script a nightly Agent job.
Remember
Backup regularly; test restores. Match recovery model to log backup strategy. VERIFYONLY catches corrupt media early.
Nightly full + hourly logs
DataVerse prod backs up full nightly, logs hourly.
Outcome: RPO stays within an hour; restores are rehearsed quarterly.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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